Solution titration in which the end point is read from the electrode-potential variations with the concentrations of potential determining ions. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Electrodes which can be used to measure the concentration of particular ions in cells, tissues, or solutions.
A broad-spectrum semisynthetic antibiotic related to TETRACYCLINE but excreted more slowly and maintaining effective blood levels for a more extended period.
Electric conductors through which electric currents enter or leave a medium, whether it be an electrolytic solution, solid, molten mass, gas, or vacuum.
Artificially produced membranes, such as semipermeable membranes used in artificial kidney dialysis (RENAL DIALYSIS), monomolecular and bimolecular membranes used as models to simulate biological CELL MEMBRANES. These membranes are also used in the process of GUIDED TISSUE REGENERATION.
Determination, by measurement or comparison with a standard, of the correct value of each scale reading on a meter or other measuring instrument; or determination of the settings of a control device that correspond to particular values of voltage, current, frequency or other output.
The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471).
The art or process of comparing photometrically the relative intensities of the light in different parts of the spectrum.
Methods utilizing the principles of MICROFLUIDICS for sample handling, reagent mixing, and separation and detection of specific components in fluids.
The study of fluid channels and chambers of tiny dimensions of tens to hundreds of micrometers and volumes of nanoliters or picoliters. This is of interest in biological MICROCIRCULATION and used in MICROCHEMISTRY and INVESTIGATIVE TECHNIQUES.
Nucleotide sequences, generated by iterative rounds of SELEX APTAMER TECHNIQUE, that bind to a target molecule specifically and with high affinity.
Materials that have a limited and usually variable electrical conductivity. They are particularly useful for the production of solid-state electronic devices.
A quaternary ammonium anticholinergic agent with peripheral side effects similar to those of ATROPINE. It is used as an adjunct in the treatment of gastric and duodenal ulcer, and to relieve visceral spasms. The drug has also been used in the form of eye drops for mydriatic effect.
A muscarinic antagonist used as an antispasmodic, in rhinitis, in urinary incontinence, and in the treatment of ulcers. At high doses it has nicotinic effects resulting in neuromuscular blocking.
Educational institutions providing facilities for teaching and research and authorized to grant academic degrees.
Inorganic salts of hydrofluoric acid, HF, in which the fluorine atom is in the -1 oxidation state. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Sodium and stannous salts are commonly used in dentifrices.
Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)
A polyvinyl resin used extensively in the manufacture of plastics, including medical devices, tubing, and other packaging. It is also used as a rubber substitute.
Surgically placed electric conductors through which ELECTRIC STIMULATION is delivered to or electrical activity is recorded from a specific point inside the body.
The study of chemical changes resulting from electrical action and electrical activity resulting from chemical changes.
The utilization of an electrical current to measure, analyze, or alter chemicals or chemical reactions in solution, cells, or tissues.
Proteins that form the CAPSID of VIRUSES.
Sweet food products combining cane or beet sugars with other carbohydrates and chocolate, milk, eggs, and various flavorings. In the United States, candy refers to both sugar- and cocoa-based confections and is differentiated from sweetened baked goods; elsewhere the terms sugar confectionary, chocolate confectionary, and flour confectionary (meaning goods such as cakes and pastries) are used.
The formation of crystalline substances from solutions or melts. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
A plant genus in the LAURACEAE family. Lindera benzoin is a source of a balsamic resin called benzoin which is up to 1/3 BENZOIC ACID. This should not be confused with the chemical BENZOIN or the plant STYRAX BENZOIDES.
An autosomal recessive inherited disorder with multiple forms of phenotypic expression, caused by a defect in the oxidative decarboxylation of branched-chain amino acids (AMINO ACIDS, BRANCHED-CHAIN). These metabolites accumulate in body fluids and render a "maple syrup" odor. The disease is divided into classic, intermediate, intermittent, and thiamine responsive subtypes. The classic form presents in the first week of life with ketoacidosis, hypoglycemia, emesis, neonatal seizures, and hypertonia. The intermediate and intermittent forms present in childhood or later with acute episodes of ataxia and vomiting. (From Adams et al., Principles of Neurology, 6th ed, p936)
A colorless, odorless gas that can be formed by the body and is necessary for the respiration cycle of plants and animals.
Inorganic compounds that contain chlorine as an integral part of the molecule.
Laboratory and other services provided to patients at the bedside. These include diagnostic and laboratory testing using automated information entry.
Communications via an interactive conference between two or more participants at different sites, using computer networks (COMPUTER COMMUNICATION NETWORKS) or other telecommunication links to transmit audio, video, and data.
An agency of the PUBLIC HEALTH SERVICE concerned with the overall planning, promoting, and administering of programs pertaining to maintaining standards of quality of foods, drugs, therapeutic devices, etc.
Care of patients by a multidisciplinary team usually organized under the leadership of a physician; each member of the team has specific responsibilities and the whole team contributes to the care of the patient.
Communication, in the sense of cross-fertilization of ideas, involving two or more academic disciplines (such as the disciplines that comprise the cross-disciplinary field of bioethics, including the health and biological sciences, the humanities, and the social sciences and law). Also includes problems in communication stemming from differences in patterns of language usage in different academic or medical disciplines.
Process that is gone through in order for a device to receive approval by a government regulatory agency. This includes any required preclinical or clinical testing, review, submission, and evaluation of the applications and test results, and post-marketing surveillance. It is not restricted to FDA.
Commercially prepared reagent sets, with accessory devices, containing all of the major components and literature necessary to perform one or more designated diagnostic tests or procedures. They may be for laboratory or personal use.
Affection; in psychiatry commonly refers to pleasure, particularly as it applies to gratifying experiences between individuals.
Sequential operating programs and data which instruct the functioning of a digital computer.
Software used to locate data or information stored in machine-readable form locally or at a distance such as an INTERNET site.
A loose confederation of computer communication networks around the world. The networks that make up the Internet are connected through several backbone networks. The Internet grew out of the US Government ARPAnet project and was designed to facilitate information exchange.
Organized activities related to the storage, location, search, and retrieval of information.
The portion of an interactive computer program that issues messages to and receives commands from a user.
A bibliographic database that includes MEDLINE as its primary subset. It is produced by the National Center for Biotechnology Information (NCBI), part of the NATIONAL LIBRARY OF MEDICINE. PubMed, which is searchable through NLM's Web site, also includes access to additional citations to selected life sciences journals not in MEDLINE, and links to other resources such as the full-text of articles at participating publishers' Web sites, NCBI's molecular biology databases, and PubMed Central.
The branch of chemistry dealing with detection (qualitative) and determination (quantitative) of substances. (Grant & Hackh's Chemical Dictionary, 5th ed)
Methodologies used for the isolation, identification, detection, and quantitation of chemical substances.
Performance of an act one or more times, with a view to its fixation or improvement; any performance of an act or behavior that leads to learning.
Shortened forms of written words or phrases used for brevity.
The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.
The specialty of ANALYTIC CHEMISTRY applied to assays of physiologically important substances found in blood, urine, tissues, and other biological fluids for the purpose of aiding the physician in making a diagnosis or following therapy.
Laboratory tests demonstrating the presence of physiologically significant substances in the blood, urine, tissue, and body fluids with application to the diagnosis or therapy of disease.
An examination of chemicals in the blood.
Devices which are used in the treatment of orthopedic injuries and diseases.
Operative immobilization or ankylosis of two or more vertebrae by fusion of the vertebral bodies with a short bone graft or often with diskectomy or laminectomy. (From Blauvelt & Nelson, A Manual of Orthopaedic Terminology, 5th ed, p236; Dorland, 28th ed)
An appreciable lateral deviation in the normally straight vertical line of the spine. (Dorland, 27th ed)
A system for verifying and maintaining a desired level of quality in a product or process by careful planning, use of proper equipment, continued inspection, and corrective action as required. (Random House Unabridged Dictionary, 2d ed)

Influence of a new antiulcer agent, ammonium 7-oxobicyclo (2, 2, 1) hept-5-ene-3-carbamoyl-2-carboxylate (KF-392) on gastric lesions and gastric mucosal barrier in rats. (1/661)

Antiulcer effects of KF-392 were studied in several experimental gastric ulcer models in rats. It was found that KF-392 given orally at 1.0 to 5.0 mg/kg had a marked suppression on the developments of Shay ulcer as well as the aspirin-, stress-, and reserpine-induced gastric lesions. The influence of KF-392 on gastric mucosal barrier was also studied. A back diffusion of H+ into the gastric mucosa and a fall of transmucosal potential difference were induced with KF-392 given orally at the above mentioned doses. KF-392 given s.c. at 5.0 mg/kg showed no inhibition of Shay ulcer and no induction of back diffusion of H+ into the gastric mucosa.  (+info)

Potential difference across the normal and the abnormal gastric mucosa in man. (2/661)

The mucosal potential difference in the body of the stomach was measured in 18 patients with gastric ulcers, five with gastritis, and three with pernicious anaemia. The results were compared with those of 12 normal volunteers. Significantly lower than normal levels were found in the groups of patients with gastric ulcers and gastritis. The patients with pernicious anaemia had even lower potential differences. In an additional 25 subjects, measurements were made in the duodenal bulb and at five sites in the stomach under direct vision at endoscopy. Biopsies were taken from each site for histology. Subjects with gastritis at the high lesser curve had a significantly lower potential difference at that site than those without gastritis. In the latter group, the potential difference at the high lesser curve was as low as in the antrum, and invariably lower than at the high greater curve.  (+info)

Characterization of DorC from Rhodobacter capsulatus, a c-type cytochrome involved in electron transfer to dimethyl sulfoxide reductase. (3/661)

The dorC gene of the dimethyl sulfoxide respiratory (dor) operon of Rhodobacter capsulatus encodes a pentaheme c-type cytochrome that is involved in electron transfer from ubiquinol to periplasmic dimethyl sulfoxide reductase. DorC was expressed as a C-terminal fusion to an 8-amino acid FLAG epitope and was purified from detergent-solubilized membranes by ion exchange chromatography and immunoaffinity chromatography. The DorC protein had a subunit Mr = 46,000, and pyridine hemochrome analysis indicated that it contained 5 mol heme c/mol DorC polypeptide, as predicted from the derived amino acid sequence of the dorC gene. The reduced form of DorC exhibited visible absorption maxima at 551.5 nm (alpha-band), 522 nm (beta-band), and 419 nm (Soret band). Redox potentiometry of the heme centers of DorC identified five components (n = 1) with midpoint potentials of -34, -128, -184, -185, and -276 mV. Despite the low redox potentials of the heme centers, DorC was reduced by duroquinol and was oxidized by dimethyl sulfoxide reductase.  (+info)

Redox components of cytochrome bc-type enzymes in acidophilic prokaryotes. I. Characterization of the cytochrome bc1-type complex of the acidophilic ferrous ion-oxidizing bacterium Thiobacillus ferrooxidans. (4/661)

The redox components of the cytochrome bc1 complex from the acidophilic chemolithotrophic organism Thiobacillus ferrooxidans were investigated by potentiometric and spectroscopic techniques. Optical redox titrations demonstrated the presence of two b-type hemes with differing redox midpoint potentials at pH 7.4 (-169 and + 20 mV for bL and bH, respectively). At pH 3.5, by contrast, both hemes appeared to titrate at about +20 mV. Antimycin A, 2-heptyl-4-hydroxyquinoline N-oxide, and stigmatellin induced distinguishable shifts of the b hemes' alpha-bands, providing evidence for the binding of antimycin A and 2-heptyl-4-hydroxyquinoline N-oxide near heme bH (located on the cytosolic side of the membrane) and of stigmatellin near heme bL (located on the periplasmic side of the membrane). The inhibitors stigmatellin, 5-(n-undecyl)-6-hydroxy-4,7-dioxobenzothiazole, and 2, 5-dibromo-3-methyl-6-isopropyl-p-benzoquinone affected the EPR spectrum of the Rieske iron-sulfur center in a way that differs from what has been observed for cytochrome bc1 or b6f complexes. The results obtained demonstrate that the T. ferrooxidans complex, although showing most of the features characteristic for bc1 complexes, contains unique properties that are most probably related to the chemolithotrophicity and/or acidophilicity of its parent organism. A speculative model for reverse electron transfer through the T. ferrooxidans complex is proposed.  (+info)

Redox components of cytochrome bc-type enzymes in acidophilic prokaryotes. II. The Rieske protein of phylogenetically distant acidophilic organisms. (5/661)

The Rieske proteins of two phylogenetically distant acidophilic organisms, i.e. the proteobacterium Thiobacillus ferrooxidans and the crenarchaeon Sulfolobus acidocaldarius, were studied by EPR. Redox titrations at a range of pH values showed that the Rieske centers of both organisms are characterized by redox midpoint potential-versus-pH curves featuring a common pK value of 6.2. This pK value is significantly more acidic (by almost 2 pH units) than that of Rieske proteins in neutrophilic species. The orientations of the Rieske center's g tensors with respect to the plane of the membrane were studied between pH 4 and 8 using partially ordered samples. At pH 4, the Sulfolobus Rieske cluster was found in the "typical" orientation of chemically reduced Rieske centers, whereas this orientation changed significantly on going toward high pH values. The Thiobacillus protein, by contrast, appeared to be in the "standard" orientation at both low and high pH values. The results are discussed with respect to the molecular parameters conveying acid resistance and in light of the recently demonstrated long-range conformational movement of the Rieske protein during enzyme turnover in cytochrome bc1 complexes.  (+info)

Extinction coefficients and midpoint potentials of cytochrome c(6) from the cyanobacteria Arthrospira maxima, Microcystis aeruginosa, and Synechocystis 6803. (6/661)

Cytochrome c(6) is a soluble heme protein that serves as a photosynthetic electron transport component in cyanobacteria and algae, carrying electrons from the cytochrome bf complex to photosystem I. The rapid accumulation of cytochrome c(6) sequence data from a wide range of species, combined with significant advances in determining high resolution three-dimensional structures, provides a powerful database for investigating the relationship between structure and function. The fact that the gene encoding cytochrome c(6) can be readily modified in a number of species adds to the usefulness of cytochrome c(6) as a tool for comparative analysis. Efforts to relate cytochrome c(6) sequence information to structure, and structural information to function depend on knowledge of the physical and thermodynamic properties of the cytochrome from different species. To this end we have determined the optical extinction coefficient, the oxidation/reduction midpoint potential, and the pH dependence of the midpoint potential of cytochrome c(6) isolated from three cyanobacteria, Arthrospira maxima, Microcystis aeruginosa, and Synechocystis 6803.  (+info)

Donnan potential of rabbit skeletal muscle myofibrils I: electrofluorochromometric detection of potential. (7/661)

The fluorescence of the dye CC-6 [(3-hexyl-2-(3-hexyl-2-benzoxazolinylidene)-1-propenyl)-benzoxazolium iodide] has been shown to indicate Donnan potentials in rabbit skeletal muscle myofibrils. These results are in agreement with previously published work in which the potentials were measured with microelectrodes on glycerol-extraced muscle fibers. The magnitude of the Donnan potential of the myofibrils has been shown to be dependent on the state (rigor or relaxed) of the system.  (+info)

A group of thermodynamic potentials applicable to ligand binding by a polyfunctional macromolecule. (8/661)

The binding of ligands by a macromolecule can be well described by a group of potentials derivable from the energy and of which the original binding potential is one. The group is Abelian and is isomorphic with a group of symmetries. Each member corresponds to a particular set of experimental conditions--system open to some, closed to others, of the ligand-and the group as a whole is an immediate source of all possible linkage relations applicable to the macromolecule. Seen in terms of information theory it can be interpreted as a program for the response of the macromolecule to its ligands according to the conditions with which it is faced. The group provides a ready formulation of the effect of a ligand on the equilibrium constant for a reaction involving a set of macromolecules, and it leads to a clear-cut distinction between true and pseudolinkage.  (+info)

Analytical Electrochemistry : Potentiometry Introduction Goals and Objectives Potentiometry Timeline Potentiometric Theory Instrumentation pH Electrodes Experiments Common Troubleshooting Tips References Goals and Objectives After completion of this e-Module, you should be able to: Describe the basic concepts of making a potentiometric measurement. Name some applications of potentiometry. Know the difference between a reference electrode and an indicator electrode. Describe the reactions of the typical reference electrodes. Define liquid junction potential and boundary potential. Describe how ion-selective electrodes (ISEs) function. Describe how both a pH electrode and a pH meter work. Describe the errors involved in pH measurements. Perform basic troubleshooting while making a pH measurement. Use the Nernst equation to perform calculations for potentiometric measurements. Click here to get started! 2
Geza Nagy and L´ývia Nagy. 7.1 Introduction 169. 7.2 The Types of Potentiometry 169. 7.2.1 Potentiometric Stripping Analysis 170. 7.2.2 Zero Current Potentiometry 171. 7.2.3 Direct Potentiometry 175. 7.2.4 Titrimetric Methods 177. 7.3 The Selectivity of Ion-selective Electrodes and Its Determination 178. 7.3.1 The Selectivity Coefficient 178. 7.3.2 Separate Solution and Mixed Solution Methods 178. 7.3.2.1 Separation Solution Methods 179. 7.3.2.2 Mixed Solution Methods 180. 7.4 Measuring Electrodes Used in Potentiometric Analysis 181. 7.4.1 Ion-selective Field Effect Transistors 183. 7.4.2 Severinghaus-type Probes 183. 7.4.3 Potentiometric Enzyme Electrodes 184. 7.5 Special Tasks 185. 7.5.1 pH Measurements 185. 7.5.2 Miscellaneous Analytical Tasks by Potentiometric Methods 190. 7.6 Application of Potentiometric Measurements for Anions 191. 7.6.1 Determination of Chloride Ion Concentration 191. 7.6.1.1 Measurement of Cl− Concentration in Milk 192. 7.6.1.2 Measurement of Cl− Concentration in ...
A new potentiometric analytical technique, termed pulsed potentiometric detection (PPD) has been developed and introduced as an end-capillary detection technique in capillary electrophoresis (CE). In contrast to normal potentiometry where the potential is measured in a steady-state, PPD involves the application of one or more independent pre-pulses to the detection electrode prior to the measurement period. The potential of the detection electrode is then allowed to move towards a steady-state value during which the potential is measured. The pulsing cycle is then repeated and a further measurement made. PPD was investigated using one or two pre-pulses of up to ±1V for 10ms on a platinum or gold detection electrode for a range of common anions separated in neutral to acidic electrolytes. Both the signal and the baseline noise were found to depend strongly on the sequence, sign and magnitude of the pre-pulses with the best results for a positive +800 mV pulse followed by a negative -800 mV ...
A lead sensitive indicator electrode was constructed with a 70 percent lead and 30 percent mercury amalgam billet. Sulfate concentrations in pure solutions, natural waters, and soil saturation extracts were determined potentiometrically using the lead-mercury amalgam indicator electrode and a standard calomel reference electrode. Sulfate concentrations over the range 0.4 to 20 milliequivalents sulfate per liter were determined with an automatic titrator and compared to a turbidimetric method for accuracy and precision. The values obtained by the two methods from twelve saturation extracts and three subsurface drainage waters were not significantly different and the potentiometric method was generally more precise. The automatic sulfate titration method has the advantages of increased sensitivity and speed.
Potentiometry passively measures the potential of a solution between two electrodes, affecting the solution very little in the process. One electrode is called the reference electrode and has a constant potential, while the other one is an indicator electrode whose potential changes with the composition of the sample. Therefore, the difference of potential between the two electrodes gives an assessment of the composition of the sample. In fact, since potentiometric measurement is a non-destructive measurement, assuming that the electrode is in equilibrium with the solution we are measuring the potential of the solution. Potentiometry usually uses indicator electrodes made selectively sensitive to the ion of interest, such as fluoride in fluoride selective electrodes, so that the potential solely depends on the activity of this ion of interest. The time that takes the electrode to establish equilibrium with the solution will affect the sensitivity or accuracy of the measurement. In aquatic ...
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Potentiometric titration is a technique similar to direct titration of a redox reaction. It is a useful means of characterizing an acid. No indicator is used; instead the potential is measured across the analyte, typically an electrolyte solution. To do this, two electrodes are used, an indicator electrode (the glass electrode and metal ion indicator electrode) and a reference electrode. Reference electrodes generally used are hydrogen electrodes, calomel electrodes, and silver chloride electrodes. The indicator electrode forms an electrochemical half cell with the interested ions in the test solution. The reference electrode forms the other half cell. The overall electric potential is calculated as Ecell = Eind - Eref + Esol. Esol is the potential drop over the test solution between the two electrodes. Ecell is recorded at intervals as the titrant is added. A graph of potential against volume added can be drawn and the end point of the reaction is halfway between the jump in voltage. Ecell ...
The Advantages of the Use of Ion- Selective Potentiometry in Relation to UV-VIS Spectroscopy. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
I basically do what you have described in your blog, with slight differences. I use a seperate bath, filled with my internal and connect it via an agarbridge (3M KCl) to my recording chamber. In the start configuration I have the internal in the pipette, the recording chamber and my ground-bath. Once the pipette makes contact with the internal in the recording chamber I use the pipette offset. BTW when entering my amp is in i=0 mode, to make sure there is no command voltage interfering. In the next step I exchange the internal in the recording chamber for my aCSF solution, dip the pipette in and read the potential. In my last step I exchange the aCSF for my internal solution to check for reversion of the potential to 0 mV, but instead the potential increases. Not to forget, I exchange the agarbridge every time I change the solution for a fresh one. As ground I use a Ag/AgCl pellet connected with the bath by an agarbridge ...
Corrosion of rebar in concrete is commonly associated with, and to a large degree influenced by, the free chloride concentration in the pore water. The amount of chloride in concrete is important because chloride can promote corrosion of steel reinforcement when moisture and oxygen are present. A potentiometric procedure that makes use of direct measurement with a chloride ion selective electrode has been developed to analyze free chloride in the pore water extracted from cement paste.16 The accuracy and reliability of this analytical technique has been checked against a certified reference material, Merck sodium chloride solution. Confidence levels (CL0.95), of 0.03 and relative standard deviations of 0.2 % for chloride were determined for ordinary Portland cement (OPC) chloride binding capacity.. Keywords: OPC, free chloride, potentiometry. ...
A new 3methyl1phenyl4arylazo5pyrazolone and 1, 3diphenyl4arylazo5pyrazolone have been synthesized and characterized by elemental analysis, IR, mass and 1H NMR spectra. The acid dissociation constants (pKa values) of the investigated ligands were determined potentiometrically and spectrophotometrically. The stability constants of the transition metal ions (VO2+, Cr3+, Mn2+, Co2+, Ni2+, Cu2+ and Zn2+) with the investigated ligands were determined potentiometrically at different ionic strengths (0.167, 0.1, 0.05 and 0.025 M) NaCl at 25oC and different temperature (25, 30, 35, and 45oC). The values of stability constants were found to decrease with increasing ionic strengths and temperature. The stoichiometries were studied using spectrophotometric and conductimetric methods, the results indicate the existence of 1:1 and 1:2 (M:L) metal:ligand species. The relationships between the stability constants of the complexes, ionization constants of the ligands have been discussed and correlated. The thermodynamic
1 Experiment 17: Potentiometric Titration Objective: In this experiment, you will use a ph meter to follow the course of acid-base titrations. From the resulting titration curves, you will determine the
Aqueous Solutions NMR, UV-Vis and Potentiometric Titrations of Cd2+ and Hg2+ with Clofibric Acid, Yahia Z Hamada, Khadijah Darboe, Aisha Darboe
TY - JOUR. T1 - Effect of hydrophilicity of marker anions on the sensitivity of end-point detection for potentiometric titrations of anionic polyelectrolytes. AU - Masadome, T.. AU - Imato, T.. PY - 1995/7/1. Y1 - 1995/7/1. M3 - Article. VL - 352. SP - 596. EP - 597. JO - Fresenius Zeitschrift fur Analytische Chemie. JF - Fresenius Zeitschrift fur Analytische Chemie. SN - 0016-1152. ER - ...
The specification of biodiesel is related to factors associated with its quality as a fuel. The iodine value as one of those quality parameters measures the degree of unsaturation present in a biodiesel composition. The unsaturated fatty acids (existence of double bonds) are susceptible to the oxidation reactions that can lead to the formation of polymeric compounds by heating. Moreover, these polymeric compounds can produce gum formation, which is detrimental to the vehicle engine due to its corrosive actions. For determining the iodine value in biodiesel, the standardized procedures use volumetric titration-with starch as an indicator-as the main technique for iodine value measurement. Some of these procedures also mention potentiometric titration as an alternative technique. This work aims to show the results of the iodine value obtained from an experimental design based on 23 factorial designs at two levels. It was performed on a biodiesel matrix from palm oil in order to indicate major ...
TY - JOUR. T1 - Electroactive materials with tunable response based on block copolymer self-assembly. AU - Terzic, Ivan. AU - Meereboer, Niels L.. AU - Acuautla, Monica. AU - Portale, Giuseppe. AU - Loos, Katja. PY - 2019/2/5. Y1 - 2019/2/5. N2 - Ferroelectric polymers represent one of the key building blocks for the preparation of flexible electronic devices. However, their lack of functionality and ability to simply tune their ferroelectric response significantly diminishes the number of fields in which they can be applied. Here we report an effective way to introduce functionality in the structure of ferroelectric polymers while preserving ferroelectricity and to further tune the ferroelectric response by incorporating functional insulating polymer chains at the chain ends of ferroelectric polymer in the form of block copolymers. The block copolymer self-assembly into lamellar nanodomains allows confined crystallization of the ferroelectric polymer without hindering the crystallinity or chain ...
A simple and rapid potentiometric method for the estimation of isoniazid in dosage forms was developed. The method was based on treating isoniazid wit..
Global Polymeric Membrane for Separation Market Report presents a professional and deep analysis on the present state of Polymeric Membrane for Separation Market 2017. The study of Polymeric Membrane for Separation industry is very important to enhance business productivity and for the study of market forecast.
Paper-based sensors, microfluidic platforms, and electronics have attracted attention in the past couple of decades because they are flexible, can be recycled easily, environmentally friendly, and inexpensive. Here we report a paper-based potentiometric sensor to detect the whole Zika virus with a minimum sensitivity of 0.26 nV/Zika and a minimum detectable signal (MDS) of 2.4×10 Zika. Our paper sensor works very similar to a P-N junction where a junction is formed between two different regions with different electrochemical potentials on the paper. These two regions with slightly different ionic contents, ionic species and concentrations, produce a potential difference given by the Nernst equation. Our paper sensor consists of 2-3 mm x 10 mm segments of paper with conducting silver paint contact patches on two ends. The paper is dipped in a buffer solution containing aptamers designed to bind to the capsid proteins on Zika. We then added the Zika (in its own buffer) to the region close to one ...
Paper-based sensors, microfluidic platforms and electronic devices have attracted attention in the past couple of decades because they are flexible, can be recycled easily, environmentally friendly, and inexpensive. Here we report a paper aptamer-based potentiometric sensor to detect the whole Zika virus for the first time with a minimum sensitivity of 2.6 nV/Zika and the minimum detectable signal (MDS) of 0.8x1e6 Zika. Our paper sensor works very similar to a P-N junction where a junction is formed between two different wet regions with different electrochemical potentials near each other on the paper. These two regions with slightly different ionic contents, ionic species and concentrations, produce a potential difference given by the Nernst equation. Our paper sensor consisted of a 2-3 mm x 10 mm segments of a paper with a conducting silver paint contact patches on its two ends. The paper is soaked in a buffer solution containing aptamers designed to bind to the capsid proteins on Zika. Atomic force
Introduction. Synthetic azo-dyes are among the most explored classes of organic compounds. Azo-dyes are widely used in many practical applications such as photochromic materials, colorants, non-linear optics, sensors and indicators.1-12 The synthesis and spectral properties of several azo-dyes as well as of their transition metal complexes have been reported in the literature.13-17 The electrochemical behavior and electrode reaction pathways of numerous azo-dyes in various supporting electrolytes were studied and discussed.18-25 Although the electrochemical behavior of some Schiff base compounds derived from 4-amino-2-methyquinoline has been reported,26 no studies concerning the electrochemical behavior of the latter one or its azo-derivatives are reported in the literature to date.. In the present work, two azo-derivatives from 4-amino-2-methylquinoline were synthesized and characterized. Their electrochemical behavior was investigated at mercury electrodes. Besides, the dissociation constants ...
Second in a series of two laboratory-based courses designed for those seeking careers in chemical technology, this course involves investigations of separation science, chemical analysis, and measurement. Students are challenged by advanced trouble shooting problems and real-world client-employee scenarios encountered by chemical technicians in the chemical process industry. Topics include electrochemical and potentiometric measurements, basic separation techniques, chemical analysis of water and biochemical systems, applications and theory behind gas chromatography and high performance liquid chromatography, and selection and application of standard methods. Advanced topics of chemical health and safety (e.g., hazardous materials management and regulatory compliance) and advanced issues of good laboratory practices (GLPs) included. Prerequisite: CHM 142 and 145.. ...
In order to monitor the chloride penetration processes, a potentiometric embedded thick-film sensor was developed. This paper includes the results of research on the characterization of Cl− sensors made of Ag/AgCl resistive pastes (materials, sensitivity and detection limit, reproducibility, reversibility and response time, long-term performance and reliability in the presence of interfering agents). Theoretical expressions have been developed to describe the potentiometric response including the presence of OH− and bromide ions. The study shows that thick-film sensors are able to monitor Cl− activity as a function of the redox potential. Sensors are also capable of providing reliable and continuous real-time information on phenomena related to the progress of the chloride penetration front in concrete specimens. These sensors are a promising tool because thick-film technology allows us to obtain miniaturized, low-cost, robust and stable long-term sensors for Cl− monitoring ...
A new unsymmetric Schiff base [(2OH) R-CH=N-(C6H4)-CH=N-R(2OH) R=phenyl, R = naphthyl] with its Fe(III) and Ni(II) complexes were synthesized by a two step method. Diimine Schiff base and its complexes were characterized by elemental analysis, mass spectra, IR, H-1/C-13-NMR spectra, TGA analysis, electronic and magnetic measurements. The phenol-imine and keto-amine tautomerism of the unsymmetric Schiff base was investigated with NMR techniques and UV-visible spectra in different solvents. Also, the protonation constants of the ligand and the stability constants of its Ni(II) and Fe(III) complexes were determined potentiometrically in 1:1(v/v) ethanol-water mixture at an ionic strength of 0.5 mol.L-1 KCl and at 25.0 +/- 0.1 degrees C. The antifungal, antimicrobial activities and the minimum inhibitory concentration (MIC) values of the compounds were evaluated against Escherichia coli (0157:H7), Micrococcus luteus (NRRLB 4975), Bacillus cereus (RSKK 863) and Candida albicans (ATCC 16231). ...
Herein, we present for the very first time a book potentiometric sensor predicated on the stimulus-responsive molecularly imprinted polymer (MIP) being a selective receptor for natural dopamine determination. recognition 0.15 M within the linear range 0.2C10 M. The selectivity design of the suggested ISEs was also examined and revealed a sophisticated selectivity towards dopamine over many phenolic substances. Constant-current chronopotentiometry can be used for analyzing the short-term potential balance of the suggested ISEs. The attained results concur that the stimulus-responsive MIPs offer an attractive way towards reversible MIP-based electrochemical detectors designation. is the binding capacity (mol/g), and are the initial and final dopamine concentration (mol/L), respectively, the sample volume (mL) and is the dried mass of the polymer (of dopamine (i.e., = 8.9) [43] to ensure that dopamine is present in its neutral form. Such related observation has been acquired by Umezawa et al [42]. ...
Now, what happens when we stick this pipette into a bath solution that has your typical extracellular saline, made to mimic extracellular fluid (i.e., mostly sodium chloride)? Well, the chemical gradients favor the pipette constituents diffusing into the bath, and the bath constituents diffusing into the pipette. But remember, the aspartate is big, so it doesnt diffuse as quickly as any of the other ionic species. That slower diffusion of the anion leaves a net negative charge in the pipette. This charge separation across the junction between two solutions is THE LIQUID JUNCTION POTENTIAL!!!11!!!1 ...
Overview: The Membrane Potential system is designed to measure potential difference (∆U or emf) in millivolts between high and low salinity in shale sands at ambient temperature. This technique determines the value of cation exchange capacity per unit pore volume (Qv) by using clay material in sample as a membrane in an electrochemical cell. System includes a quick load core holder with confining pressure up to 1,500psi for 1 OD samples with peek endcaps for electrical isolation. The reservoirs height is adjustable to ensure no diffusion between high and low salinity brines which is critical to measure liquid/liquid junction potential (U0). This complete system consists of: ASME Core holder 1500psi for 1.0
For electrophysiological tests, slices were submerged into a perfusion chamber with a constant flow of oxygenated ACSF. The flow rate was set to 1-2 ml/min. During the recordings, the chamber temperature was maintained at 26-27°C. The preceding experiments at various temperatures (range of 23-30°C) showed that, under the given conditions, slices from animals older than 1 year were best maintained at this temperature, the quality criterion being the level of astrocytic membrane potentials at break-in, in addition to the visual appearance of the slices. Pipette resistance was 3-6 MΩ when filled with the following saline (in mm): 100 K-gluconate, 50 KCl, 5 NaCl, 0.5 CaCl2, 5 EGTA, 25 HEPES, 2 Mg-ATP, and 0.3 GTP. Electrophysiological signals were acquired using an EPC-8 amplifier (List), a 16-bit analog-to-digital board (ITC-16; HEKA Elektronik), and the software TIDA 4.11 (HEKA Elektronik). The signals were sampled at a rate of 10 kHz and filtered at 3 kHz. Liquid junction potentials were not ...
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In recent years, growing environmental concerns have fueled the need for efficient oil and water separation systems. Membranes leveraging contrasting wetting properties have received significant attention for their ability to selectively permeate one component while rejecting the other. However, separation of droplets below a micron in size remains a key challenge. Examination of the wettability characteristics of a membrane gives rise to the concept of the breakthrough pressure - the maximum transmembrane pressure at which a membrane can operate retaining high selectivity. These separation principles are experimentally verified using a model system of through-pore membranes chemically engineered with desired wetting properties. To overcome the flux limitations imposed by the breakthrough pressure, we extend our findings to hierarchical polymeric membranes. A novel fabrication scheme is employed to control the skin layer thickness to optimize the permeability, and we demonstrate separation of ...
A device suitable for potentiometric analysis of liquid ions is disclosed, wherein a liquid transport member extending between and adjacent to two electrodes comprises two opposed surfaces spaced apart a distance to induce capillary flow of liquid between the surfaces.
Introduction to chemical analysis, including gravimetric, volumetric, spectrophotometric, and potentiometric analyses. Laboratory computer use included. Prerequisite: either CHEM 153, CHEM 155, or CHEM 162. Offered: AWSpS.
The pH meter measures the pH of a solution using an ion-selective electrode (ISE) that responds to the H+ concentration of the solution. The pH electrode produces a voltage that is proportional to the concentration of the H+ concentration, and making measurements with a pH meter is therefore a form of potentiometry. The pH electrode is attached to control electronics which convert the voltage to a pH reading and displays it on a meter. ...
The interaction of Eu(III) ion with 7-carboxymethoxy-4-methylcoumarin (CMMC) has been investigated using the potentiometric method in the ethanol-water mixture solvent (0.15 volume fraction). The formation of the different binary, ternary complexes is confirmed by the corresponding pH-potentiometric curves. SUPERQUAD computer program has been used for the refinement of all the calculated constants in our present study. Electroanalytical techniques have been used to confirm the formation of different binary and ternary complexes under investigation. The binding constant of the ternary complex Eu(III)-CMMC-DNA calculated by cyclic voltammetry (CV) and differential pulse (DP) was found to be 1.8 and 2.5x 105 M-1 in Tris-HCl, respectively. The changes in the current intensity have been used for the quantitative determination of DNA over a linear concentration range with LOD of 1.0-1.3 µg/ ml in 0.1 M Tris-HCl buffer.. ...
Mesquita R.B.R., Santos I.C., Pedrosa M.F.F., Duque A.F., Castro P.M.L. and Rangel A.O.S.S. (2011). Development of flow injection potentiometric methods for the off-line and on-line determination of fluoride to monitor the biodegradation of a monofluorophenol in two bioreactors. Talanta 84:1291-1297 ...
Herein, thin-layer potentiometry combined with ion-exchange membranes as barriers for charged interferences is demonstrated for the analytical detection of creatinine (CRE) in undiluted human urine. Briefly, CRE diffuses through an anion-exchange membrane (AEM) from a sample contained in one fluidic compartment to a second reservoir, containing the enzyme CRE deiminase. There, CRE reacts with the enzyme, and the formation of ammonium is dynamically monitored by potentiometric ammonium-selective electrodes. This analytical concept is integrated into a lab-on-a-chip microfluidic cell that allows for a high sample throughput and the operation under stop-flow mode, which allows CRE to passively diffuse across the AEM. Conveniently, positively charged species (i.e., potassium, sodium, and ammonium, among others) are repelled by the AEM and never reach the ammonium-selective electrodes; thus, possible interference in the response can be avoided. As a result, the dynamic potential response of the ...
Air, Quality, Air pollution, Pollutant gases, Combustion products, Gas analysis, Chemical analysis and testing, Determination of content, Hydrogen chloride, Gases, Quantitative analysis, Absorptiometry, Spectrophotometry, Potentiometric methods, Ion-exchange methods, Chromatography, Mathematical calculations, Verification, Accuracy, Interferences (chemical), Chlorides ...
Download summary (PDF). 1. Emilia BALABANOVA. Synthesis of nanostructured materials by means of thermal plasma. Modelling of the processes.. Download Art 1 (PDF). Key words: catalysis, kinetics, deactivation, reaction mechanism. 2. Achour TERBOUCHE, Safia DJEBBAR, Ouassini BANALI-BAITICH, Mustayeen KHAN and Gilles BOUET. Stability and molecular modelling of cobalt(II) and nickel(II) with polydentate Schiff base. Download Art 2 (PDF). Key words: polydentate ligand, complexes, potentiometry, stability constants, molecular modelling. 3. Maria Elena GRAD, Georgeta Maria SIMU, Alfa Xenia LUPEA, Ştefan TOMAS and Aurelia PASCARIU. Synthesis and colour assessment of some new stilbene azo dyes.. Download Art 3 (PDF). Key words: azo-stilbene dyes, colour analysis. 4. Cristina TABLET, Magda FIFIRIG and Mihaela HILLEBRAND. An alternative approach on electron transfer mechanism of the fluorescence quenching of 3-carboxy-5,6-benzocoumarin by some aromatic amines. Download Art 4 (PDF). Key words: coumarin ...
BN reference standards are intended for use in the determination of Base Number(BN)in petroleum products in accordance with ASTM D2896/IP 276 (by potentiometric perchloric acid titration) or ASTM D4739 (by potentiometric titration).
A sensor utilizing a non-leachable or diffusible redox mediator is described. The sensor includes a sample chamber to hold a sample in electrolytic contact with a working electrode, and in at least some instances, the sensor also contains a non-leachable or a diffusible second electron transfer agent. The sensor and/or the methods used produce a sensor signal in response to the analyte that can be distinguished from a background signal caused by the mediator. The invention can be used to determine the concentration of a biomolecule, such as glucose or lactate, in a biological fluid, such as blood or serum, using techniques such as coulometry, amperometry, and potentiometry. An enzyme capable of catalyzing the electrooxidation or electroreduction of the biomolecule is typically provided as a second electron transfer agent.
The complexation of Ni2+ and Cu2+ by the tripodal amine phenol ligands 1,2,3-tris(2-hydroxy-5-sulfobenzylamino)propane (H(6)TAPS) and 1,1,1-tris(2-hydroxy-5-sulfobenzylaminomethyl)ethane (H(6)TAMS) has been studied by potentiometry and UV/VIS spectrophotometry. Both metals form [M(H3L)](-), [M(H2L)](2-), [M(HL)](3-) and [ML](4-) complexes and in addition Cu2+ forms [ML(OH)](5-) complexes. The complex formation constants for these species have been measured at 25 degrees C (I = 0.16 M NaCl): for Cu2+ (Ni2+) with H(6)TAPS log K{[M(H3L)](-)} = 41.73 (36.88), log K{[M(H2L)](2-)} = 38.53 (31.86), log K{[M(HL)](3-)} = 34.45 (25.79), log K{[ML](4-)} = 28.07 (17.53) and log K{[ML(OH)](5-)} = 18.96. The corresponding values for H(6)TAMS are 40.20 (36.96), 35.99 (31.91), 29.40 (26.33), 20.20 (18.82) and 9.68. The co-ordination number and geometry of these complexes was investigated by variable pH UV/VIS spectrophotometry; Ni2+ and Cu2+ show differing complexation behaviour. With both H(6)TAPS and ...
The complexation of Ni2+ and Cu2+ by the tripodal amine phenol ligands 1,2,3-tris(2-hydroxy-5-sulfobenzylamino)propane (H(6)TAPS) and 1,1,1-tris(2-hydroxy-5-sulfobenzylaminomethyl)ethane (H(6)TAMS) has been studied by potentiometry and UV/VIS spectrophotometry. Both metals form [M(H3L)](-), [M(H2L)](2-), [M(HL)](3-) and [ML](4-) complexes and in addition Cu2+ forms [ML(OH)](5-) complexes. The complex formation constants for these species have been measured at 25 degrees C (I = 0.16 M NaCl): for Cu2+ (Ni2+) with H(6)TAPS log K{[M(H3L)](-)} = 41.73 (36.88), log K{[M(H2L)](2-)} = 38.53 (31.86), log K{[M(HL)](3-)} = 34.45 (25.79), log K{[ML](4-)} = 28.07 (17.53) and log K{[ML(OH)](5-)} = 18.96. The corresponding values for H(6)TAMS are 40.20 (36.96), 35.99 (31.91), 29.40 (26.33), 20.20 (18.82) and 9.68. The co-ordination number and geometry of these complexes was investigated by variable pH UV/VIS spectrophotometry; Ni2+ and Cu2+ show differing complexation behaviour. With both H(6)TAPS and ...
TY - JOUR. T1 - In vitro and in vivo studies of the dermally absorbed Cu(II) complexes of N5O2 donor ligands - Potential anti-inflammatory drugs. AU - Odisitse, Sebusi. AU - Jackson, Graham E.. PY - 2009. Y1 - 2009. N2 - Copper complexes of N,N′-di(aminoethylene)-2,6-pyridinedicarbonylamine and bis-(N,N-dimethylethyl)-2,6-pyridinedicarboxamide have been studied by glass electrode potentiometry, NMR, UV and IR spectroscopy as potential anti-inflammatory agents for the alleviation of inflammation associated with rheumatoid arthritis. The protonation and formation constants with Cu(II), Zn(II) and Ca(II), determined at 25 °C and an ionic strength of 0.15 mol dm-3 were used to calculate the copper plasma mobilizing index of the ligands. Spectroscopic studies suggested that metal ion complexation promotes deprotonation and coordination of the amide nitrogens resulting in overall tetragonal distorted copper complexes. Bio-distribution and dermal absorption studies showed the complexes to have ...
CHEM 242 is the laboratory component of the CHEM 241/242 course sequence. Experiments include studies of equilibria (titration, potentiometry), separations (gas and liquid chromatography), electrochemistry, and spectroscopy (atomic and molecular absorption and emission). Grading is based on laboratory reports.. Note: This course is linked to CHEM 241. Students must elect both CHEM 241 (for 2 credits) and CHEM 242 (for 2 credits) in the same term. ...
Using constant current chronopotentiometry we showed that in 50 mM sodium phosphate (pH 7) bovine serum albumin and some other proteins were not significantly denatured at a bare mercury electrode while at higher phosphate concentrations they underwent electric field-driven denaturation on the electrode surface ...
Over the years, electrochemical instruments have become an integral part of research laboratories across the globe and are routinely employed to monitor processes in biotechnology and pharmaceutical, environmental testing, agriculture and food and academic institutions.. In 2014, the electrochemical meters segment accounted for a major share of the electrochemical instruments products market. On the basis of type, the electrochemical meters market is further segmented into benchtop meters and portable meters. In 2014, the benchtop meters accounted for the largest share of the electrochemical meters market; the potentiometry segment accounted for the largest share of the electrochemical instruments market, by technology; and the environmental testing industry segment accounted for the largest share of electrochemical instruments end user market. In 2014, Europe accounted for the largest share of the electrochemical instruments market, followed by North America, Asia-Pacific, and the Rest of the ...
Two DO3A-based ligands appended with the propylphosphonate side arm and their Ln3+ complexes were investigated. Proton relaxometric in vitro studies at 20 MHz and 60 MHz and 37 °C of the Gd3+ complex containing free acid exhibited relative changes of up to 56% in r1 relaxivity when the pH of the medium was changed from 4 to 7. This change is explained by the decrease in the number of coordinated water molecules from two to one. Temperature-dependent relaxivity and NMRD profiles of Gd3+ complexes showed a fast water exchange and a slightly increased rotational correlation time, which is characteristic of phosphonate-containing compounds. Thermodynamic and kinetic studies of the Gd3+ and Eu3+ complexes were performed by means of potentiometry and luminescence spectroscopy. The results indicate that the thermodynamic stability and kinetic inertness of these complexes are sufficient for their in vivo application. ...
Latitude and longitude information was collected using various hand-held GPS units. Location coordinates were recorded in a field notebook and subsequently transferred to the project database. The pH values were measured in the field using various digital pH meters. The pH meter was calibrated at least once per day using a 2- to 3-point calibration with pH standards of 4, 7, and 10. Surface water samples taken for cation and anion analysis were filtered in the field using a 0.45 micron filter and peristaltic pump, following standard clean techniques. Anion concentrations were determined at the U.S. Geological Survey (USGS) laboratories in Menlo Park, California using a DIONEX ICS-2000 ion chromatograph with hydroxide eluent. Alkalinity (as bicarbonate) was analyzed by potentiometric titration on samples with pH , 5.Samples that contain more than about 100 mg/L of any one analyte are diluted prior to analysis, resulting in more than one detection limit per analyte. In some cases bdl is used as ...
Looking for online definition of potentiometric titration in the Medical Dictionary? potentiometric titration explanation free. What is potentiometric titration? Meaning of potentiometric titration medical term. What does potentiometric titration mean?
1984) Direct determination of cyanide in seawater by ion selective electrode potentiometry. In: 6th Australian Electrochemistry Conference, 19 - 24 February, Geelong, Australia. ...
An improved solid-state ion-selective electrode has greater uniformity of asymmetric potential and high sensitivity and selectivity for the cation of interest. The electrode comprises: (1) a porous element comprising graphite; (2) an electrochemical reference in substantially dry form on at least a portion of the element, the reference comprising: (a) an oxidant and (b) a reductant that is the conjugate of the oxidant, the oxidant and reductant being present in about equimolar quantities; and (3) a polymeric membrane comprising an ion-selective ionophore in electrochemical contact with the electrochemical reference. The electrode can be prepared to be selective for one of a number of cations, including lithium and ammonium. Methods for preparing these electrodes are also disclosed.
Multiphase reactions are often constrained by mass transfer limitations which in many cases lead to low reaction rates and undesirable product distribution. Here we fabricate integral-asymmetric polymeric membranes decorated with metal catalysts, to supply hydrogen directly at or near the surface of the catalyst, thus minimizing mass-transfer limitations. The metal decorated polymeric membranes were used for partial hydrogenation of soybean oil with the goal to minimize trans fatty acid (TFA) formation. It was discovered that polymeric membranes with defective metal coatings are well suited to achieve low-TFA hydrogenation of soybean oil at quite moderate process conditions. The metal decorated polymeric membranes studied produced significantly lower trans fatty acid as compared to traditional reactors (3.5 wt% at an Iodine Value of 95 as compared to 8 wt% in slurry reactor), at pressures and temperatures which are compatible with the existing systems. The process concept is simpler than some ...
Shop Ricca Chemical, For Test Methods - Potentiometric Titration, Color-Indicator Titration, Acidity in Aviation Turbine Fuel Clinical Analyzer Calibrators and Reagents ...
Equations were developed for the calculation of the second stoichiometric (molality scale) dissociation constants (Km2) of a-alanine, valine, and leucine in aq. KCl solutions at 298.15 K from the revised thermodynamic dissociation constants (Ka2) of these acids and the ionic strength (Im) of the solutions. The ionic strength of the solutions considered in this study is determined mostly by KCl alone, and the equations for Km2 were based on the single-ion activity coefficient equations of the H�ckel type. The existing literature data obtained from Harned cell measurements and new potentiometric titration data were used to revise the Ka2 values of the three amino acids. The values (1.295 � 0.013) � 10�10, (1.894 � 0.009) � 10�10, and (1.685 � 0.011) � 10�10 were obtained from the new potentiometric titration data for a-alanine, valine, and leucine, respectively. For alanine and valine, the new Ka2 values are also supported by the Harned cell data ...
Lightaddressable potentiometric sensor (LAPS) can be used to determine organophosphorus insecticides by immobilizing acetyl cholinesterase (AchE) on its Si3N4 film (H+ selective).The operating principle and the way of preparation of the sensor are introduced ,and the influence of Tris buffer and acetylcholine substrate is also analyzed. Moreover the response characteristics under various inhibition time and various organophosphorus concentration are discussed. As a new approach to determine insecticides, this method has the advantages of simple operation,high sensibility and high efficiency.
TY - JOUR. T1 - Immobilization of cross-linked lipase aggregates within microporous polymeric membranes. AU - Hilal, N.. AU - Nigmatullin, R.. AU - Alpatova, A.. PY - 2004/7/15. Y1 - 2004/7/15. N2 - A new approach is proposed to immobilize lipase into microporous polymeric membrane via embedding cross-linked enzyme aggregates (CLEA) within membrane pores. Preparation of biocatalytic membranes was implemented with hydrophilic cellulose and hydrophobic PTFE membranes. Formation of lipase CLEAs is initiated by solvent exchange between aqueous solution of the enzyme filling membrane pores and organic media containing cross-linking agent. The influence of organic media composition and matrix hydrophilicity/hydrophobicity on membrane biocatalytic properties has been studied. Highly effective biocatalytic membranes with embedded lipase CLEA have been obtained on the base of both hydrophilic and hydrophobic membranes by varying the content of glutaric dialdehyde used as a cross-linking agent. ...
1. Charge transport in single-phase and multiphase systems Electron conductive materials. Electrolyte solutions. Solid electrolytes. Melts of electrolytes. Ion-conducting polymers. Electrodes and primary cells. Membranes. Coulometry. Conductometry. 2. Electrochemical equilibriua Electrochemical potential. Thermodynamic conditions of the equilibrium. Electroneutrality condition. Electric potential and composition of the phase. Theory of the activity coefficient. Dissociation of electrolytes and ionic association. Slightly soluble electrolytes. Protolytic (acid-base) reactions. Nernst and Donnan potential difference. Absolute electrode potential. Electric double layer. Galvanic cells. Liquid junction potential. Voltaic cells (Kelvin probe). 3. Electrochemical kinetics Polarization of the electrodes. Galvanic cells and electrolysers. The polarization methods. Kinetics of simple electron transfer reaction. Kinetic of the surface electron transfer reactions. Kinetic of ion transfer reaction. Rate of ...
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics. ...
Chemistry Assignment Help, Clarks method or soap titration method, CLARKS METHOD OR SOAP TITRATION METHOD: This method depends upon the fact that when soluble soap is added to hard water, constituent of hard water. Ca, Mg and other heavy metals react with to form insoluble compounds. The lather is only produced wh
HIDER__ ,hide, Hi Christin, To be honest I do not think so it is possible to reach the sensitivity range you want (nM). Potentiometric methods are known to have the detection limit around 10-6M (especially for the ion-selective electrodes). In some of the cases of ion-selective electrodes you could go up to 10-9M (look in the literature for Pretsch E or Sokalski T) but personally I do not think you can do that for pH-selective sensors. The only one thing that comes into my mind at the moment is e.g. tri-enzyme sensitive electrode. It would be amperometric set-up and so you could go much lower in the limit of detection. The path of determination would be e.g. choline esterase converts butyryl choline into butyric acid and choline in presence of water. Then choline is transformed in the presence of oxygen and choline oxidase into betaine and hydrogen peroxide. Then H2O2 is converted using peroxidase into water. Of course H2O2 is a electrochemically detectable. I send you an example of paper were ...
A sensitive and reliable potentiometric biosensor for determination of penicillin has been developed by exploiting the self-limiting growth of the non-conducting polymer, polytyramine. Optimum polytyramine-penicillinase (PTy-PNCnase) films for potentiometric detection of penicillin were accomplished with monomer solutions which contained 0.03 M tyramine, 37 U/mL penicillinase, 0.01 M KNO3,and 3 mM penicillin with an applied current density of 0.8 mA/cm2 and an electropolymerisation time of 40 seconds. The potentiometric biosensor gave a linear concentration range of 3-283 µM for penicillin and achieved a minimum detectable concentration of 0.3 µM. The biosensor was successfully utilized for the detection of Amoxycillin and gave an average percentage recovery of 102 ± 6%. Satisfactory recoveries of penicillin G were also achieved in milk samples with the potentiometric biosensor when concentrations are ≥20 ppm.
Oriental Journal of Chemistry is a peer reviewed quarterly research journal of pure and applied chemistry. It publishes standard research papers in almost all thrust areas of current chemistry of academic and commercial importance. It provides a platform for rapid publication of quality research papers, reviews and chemistry letters. Oriental Journal of Chemistry is abstracted and indexed in almost all reputed National and International agencies.
Triboelectric nanogenerators are an energy harvesting technology that relies on the coupling effects of contact electrification and electrostatic induction between two solids or a liquid and a solid. Here, we present a triboelectric nanogenerator that can work based on the interaction between two pure liquids. A liquid-liquid triboelectric nanogenerator is achieved by passing a liquid droplet through a freely suspended liquid membrane. We investigate two kinds of liquid membranes: a grounded membrane and a pre-charged membrane. The falling of a droplet (about 40 μL) can generate a peak power of 137.4 nW by passing through a pre-charged membrane. Moreover, this membrane electrode can also remove and collect electrostatic charges from solid objects, indicating a permeable sensor or charge filter for electronic applications. The liquid-liquid triboelectric nanogenerator can harvest mechanical energy without changing the object motion and it can work for many targets, including raindrops, irrigation
Field recordings of PSPs were performed in current-clamp mode with a recording patch pipette (3-5 MΩ) containing 1 m NaCl and positioned in the middle of stratum radiatum (SR) or stratum pyramidale in CA1 or CA2. Whole-cell recordings were obtained from CA2 PNs in current-clamp mode held at −73 mV with a patch pipette (3-5 MΩ) containing the following (in mm): 135 K methyl sulfate, 5 KCl, 0.1 EGTA-Na, 10 HEPES, 2 NaCl, 5 ATP, 0.4 GTP, 10 phosphocreatine, and 5 µm biocytin, pH 7.2 (280-290 mOsm). Inhibitory currents were recorded with pipette solution containing 135 Cs methyl sulfate instead of K methyl sulfate. The liquid junction potential was ∼1.2 mV, and membrane potentials were corrected for this junction potential. Some recordings were performed with the perforated patch technique. For these experiments, 75 μg/ml gramicidin was added to the intracellular solution along with an additional 4 mm calcium to ensure that recordings were acquired in perforated configuration only. Series ...
Nanostructuring surfaces in order to improve the quality of determinations, in terms of detection limit and signal-to-noise ratio, had received a great attention in the last years. At this effect, a potentiometric for the determination of lactate, based on a nanostructured (ND) Si4N3 surface, is presented here. The potentiometric sensor developed is an electrolyte¿membrane¿insulator¿semiconductor (EMIS). The surface was first modified by a polyacrylic acid (PAA) layer, deposited by plasma enhanced chemical vapor deposition (PECVD), that can covalently link to the NH2 groups of the lactate dehydrogenase. Secondly, the nanostructures were formed on the surface by colloidal lithography. The obtained nanostructured surface was characterized. The stability of the biosensor in aqueous media was investigated obtaining a sensitivity of 49.7mV per decade. The detection limit for the determination of lactate was 2×10-7 M, with a linear range up to 10-5 M. The intra- and inter-electrode standard ...
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All-solid-state ion-selective electrodes as potentiometric ion sensors for lithium, sodium, and potassium have been demonstrated by installing a composite layer containing a powder of alkali insertion materials, LixFePO4, Na0.33MnO2, and KxMnO2·nH2O, respectively, as an inner solid-contact layer between the
TY - JOUR. T1 - Separation properties of surface modified silica supported liquid membranes for divalent metal removal/recovery. AU - Cooper, C. A.. AU - Lin, Y. S.. AU - Gonzalez, M.. PY - 2004/2/1. Y1 - 2004/2/1. N2 - The synthesis and separation properties of a mesoporous silica supported liquid membrane (SLM) were studied. The membranes consisted of a silica layer, from dip-coated colloidal silica, on an α-alumina support, modified with dichlorodimethyl silane (DCDMS) to add surface methyl groups to the silica layer. 2-Hydroxy-5-nonylacetophenome oxime (LIX-84) was entrapped within the pores of the silica due to hydrophobic interactions between the surface methyl groups and the long hydrocarbon chain from the LIX-84. The goal of synthesizing the membrane in this manner was to enhance the stability of SLMs. The membranes made after two-time dip-coating demonstrated good stability (no sign of LIX loss after 12 days) and uphill Cu2+ transport against the concentration gradient. Regardless of ...
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Researchers at Zansors LLC are developing a generalizable electrochemical biosensing platform for detection of metal ions in water. Specifically, they are validating the design of a convenient, cost-effective electrochemical ion (E-ION) sensing platform for direct detection of metal ion contaminants such as mercury (Hg2+), silver (Ag+), and copper (Cu2+) in drinking water. While previously developed metal ions sensors have been demonstrated to possess exceptional sensitivity and selectivity, no generalizable sensor architecture that is applicable to the detection of a wide range of metal ions has been realized to date.. The E- ION sensors signaling mechanism relies on the dampening of the DNA recognition probe dynamics upon target binding which involves inter-strand metal complexation, thereby creating a sensor that is inherently signal-off when interrogated using alternating current voltammetry. However, by varying the applied frequency in square wave voltammetry, these sensors can be ...
Treatment of Oil in Water Emulsions by Ceramic-Supported Polymeric Membranes. A novel membrane was developed by growing polymer chains from the surface of a porous ceramic support, resulting in a composite membrane which combines the mechanical properties of the inorganic membrane with the selective interactions of the polymer. The configuration of the grafted polymer brush layer is determined by solvent - polymer interactions, with a hydrophilic polymer being stretched away from the surface by aqueous solutions and collapsed against the surface by organic solvents. This behavior of the grafted chains provides Ceramic-Supported Polymeric (CSP) membranes with unique properties for certain water treatment applications. One application envisioned for these CSP membranes, in which the selectivity is influenced by interactions between the solvent and the grafted polymer, is the cross-flow filtration of an oil-in-water emulsion. In this case, a hydrophilic grafted polyvinylpyrrolidone (PVP) brush layer
This work uncovers the application of porphyrin dimers for the use in electroanalysis, such as potentiometric determination of ions. It also puts in question a current perception of an occurrence of the super-Nernstian response, as a result of the possible dimerization of single porphyrins within an ion-selective membrane. To study that, four various porphyrin dimers were used as ionophores, namely, freebase-freebase, Zn-Zn, Zn-freebase, and freebase-Zn. Since the Zn-freebase and freebase-Zn porphyrin dimers carried both anion- and cation-sensitive porphyrin units, their application in ISEs was utilized in both anion- and cation-sensitive sensors. With respect to the lipophilic salt added, both porphyrins dimers were found anion- and cation-sensitive. This allowed using a single molecule as novel type of versatile ionophore (anion- and cation-selective), simply by varying the membrane composition. All anion-sensitive sensors were perchlorate-sensitive, while the cation-selective sensors were ...
While solid-state diffusion is in general a slow process, exceptions are found in certain kinds of inorganic materials, predominantly concerning small cations moving in an environment of large and chemically soft anions. [...] We have used a potentiometric method, recording the change in potential after a perturbing current pulse and have studied three sulphides under the [radioactive waste] repositary conditions, namely chalcocite, chalcopyrite and bornite. ...
TY - JOUR. T1 - Acid-base and spectroelectrochemical properties of doubly N-confused porphyrins. AU - Araki, K.. AU - Winnischofer, H.. AU - Toma, H. E.. AU - Maeda, H.. AU - Osuka, A.. AU - Furuta, Hiroyuki. PY - 2001/4/23. Y1 - 2001/4/23. N2 - The cis-doubly N-confused porphyrin, H2N2CP, containing two adjacent confused pyrrole rings has been investigated from the point of view of its acid-base and electrochemical behavior in dichloromethane. This novel porphyrin isomer can form two metal-carbon bonds in the central core, stabilizing metal ions in unusually high oxidation states. Furthermore, the two outside N-pyrrole atoms remain available for acid-base and specific solvent interactions. Protonation of the pyrrole N atoms proceeds according to two successive steps, while only a single deprotonation step has been observed in the presence of bases. Similarly, in the case of the silver and copper complexes the protonation and deprotonation of the outer pyrrole rings have been detected, ...
This study was focused on the description of interaction between Cu2+ ions and the 1:1 mono- and dirhamnolipid mixtures in the premicellar and aggregated state in water and 20 mM KCl solution at pH 5.5 and 6.0. The critical micelle concentration of biosurfactants was determined conductometrically and by the pH measurements. Hydrodynamic diameter and electrophoretic mobility were determined in micellar solutions using dynamic light scattering and laser Doppler electrophoresis, respectively. The copper immobilization by rhamnolipids, methylglycinediacetic acid (MGDA), and ethylenediaminetetraacetic acid (EDTA) was estimated potentiometrically for the Cu2+ to chelating agent molar ratio from 16:100 to 200:100. The degree of ion binding and the complex stability constant were calculated at a 1:1 metal to chelant molar ratio. The aggregates of rhamnolipids (diameter of 43-89 nm) were negatively charged. Biosurfactants revealed the best chelating activities in premicellar solutions. For all chelants studied
Polymeric membranes from blends of sulfonated polysulfones (SPSF) and polybenzimidazole (PBI) doped with phosphoric acid were developed as potential high-temperature polymer electrolytes for fuel cells and other electrochemical applications. The water uptake and acid doping of these polymeric membranes were investigated. Ionic conductivity of the membranes was measured in relation to temperature, acid doping level, sulfonation degree of SPSF, relative humidity, and blend composition. The conductivity of SPSF was of the order of 10/sup -3/ S cm/sup -1/. In the case of blends of PBI and SPSF it was found to be higher than 10/sup -2/ S cm/sup -1/. Much improvement in the mechanical strength is observed for the blend polymer membranes, especially at higher temperatures. Preliminary work has demonstrated the feasibility of these polymeric membranes for fuel-cell ...
Another word for backside. Find more ways to say backside, along with related words, antonyms and example phrases at Thesaurus.com, the worlds most trusted free thesaurus.
Dive into the research topics of A spectroelectrochemical investigation of the heme-based sensor DevS from Mycobacterium tuberculosis: a redox versus oxygen sensor. Together they form a unique fingerprint. ...
ACE Axcel, the next-generation clinical chemistry system from Alfa Wassermann, sets the standard for excellence in todays Physicians Office Laboratory. Processing up to 285 tests per hour with both photometric and potentiometric detection technologies, the ACE Axcel helps physicians quickly diagnose and effectively monitor patients, delivers a reliable revenue stream for business, and eases and streamlines procedures for laboratory personnel ...
We have measured the current induced voltage drop along an individual multiwall carbon nanotube as a function of the distance to the current injecting electrode. The measurements have been performed at room temperature using scanning probe potentiometry combined with scanning electron microscopy. For a nanotube with an incomplete outer shell, a sharp potential jump was observed at the end of the outermost shell. The electric potential variation along the carbon nanotube has been used to determine the contact resistance between metal electrodes and the tube, the intrashell resistance, and the intershell conductance. ...
The Epsilon EClipse™ is the latest electrochemical analyzer manufactured by BASi. It is a potentiostat/galvanostat with a second working electrode for bipotentiostat measurements. It comes with software that enables the most popular electrochemical techniques such as cyclic voltammetry, chronoamperometry, and chronopotentiometry (select Techniques below for a more complete list). The Basic Plus software can be purchased to enable pulsed voltammetry and stripping voltammetry techniques.. ...
SOUDAL SOUDAGUM LIQUID MEMBRANE is a polymer dispersion with mineral fillers, a plasticizer, a flow controlling agent and preservation additives. It is a fast-drying & ready to use.
Sika Acquires Technology Leader in Liquid Membranes Sika AG has acquired Iotech Group Limited, with headquarters in England and subsidiaries in the UK, U.S. and Belgium. Iotech Group revenues totaled $55 million for the year 2008. Iotech specia
Theoretical and practical aspects of the most important instrumental techniques used in chemical analysis, including potentiometry, coulometry, voltammetry, UV/Visible absorption spectrophotometry, fluorescence spectrophotometry, atomic spectrometry, gas chromatography, and high-performance liquid chromatography. Three hours of lecture and one four-hour laboratory per week.. ...
Physico-chemical characterization of some beta blockers and anti-diabetic drugs - potentiometric and spectrophotometric pKa determination in different co-solvents
One way to quantify whether a substance is a strong oxidizing agent or a strong reducing agent is to use the oxidation-reduction potential or redox potential. Strong reducing agents can be said to have a high electron-transfer potential. Strong oxidizing agents have low electron-transfer potential. Oxidizing and reducing agents occur as couples, with a strong reducing agent coupled with a weak oxidizing agent and vice versa. Since these processes involve the transfer of electrons, the measurement of the resulting charge separation can be quantified in voltage measured between the couple and a standard hydrogen half-cell with 1 molar hydrogen and 1 atmosphere of hydrogen pressure on it. The redox potential of the hydrogen is zero at pH=0, but for tabulations a pH=7 is used for the hydrogen and under those conditions its redox potential is -0.421 volts. As a useful reference, the redox potentials of couples that commonly occur in biochemistry can give insight into their roles in biological energy ...
Clifton, C.E.; Cleary, J.P., 1934: Oxidation-reduction Potentials and Ferricyanide Reducing Activities in Glucose-peptone Cultures and Suspensions of Escherichia coli
Thermodynamic proton dissociation constants (K_a^T) of the hydrochlorides of some α-amino acid methyl, ethyl and benzyl esters have been determined by potentiometric titration at 25, 37.1 and 50.2°C, and at I = 0.1 mol 1⁻¹. From this temperature dependence, the energetics of the reactions (ΔG˚ , ΔH˚ , ΔS0˚values) were determined and examined. The ester hydrochlorides of the 2-amino acids have pK_a^T values that are about 2 units lower than the corresponding n-alkylammoniums. The major contributors to this large ΔG˚ lowering (acid strengthening) are the strong -I effect of the adjacent alkoxy/benzyloxy carbonyl group which produces a large decrease in ΔH˚ and a reduction in the nett solvent (H₂0) bonding for the free base form of the ester (E) which increases ΔS˚ • pK_a^T values rise sharply from 2-aminoethanoic acid methyl ester hydrochloride (2-AE Me·HCI) to 3-aminopropanoic acid methyl ester hydrochloride (3-AP Me·HCl). There are much smaller rises with further increases ...
AN reference standards are intended for use in the determination of Acid Number(AN)in petroleum products by potentiometric titration.
AN reference standards are intended for use in the determination of Acid Number(AN)in petroleum products by potentiometric titration.
E-mail: [email protected] Abstract: Advanced studies are now expected under cooperation of medical and electrophysical researchers. Actual operation of neurons remains much unknown. Neurons and unicellular organisms are controlled by mutual interactions and external conditions. She will present recent studies in neurons referring conventional studies of experiments. Novel result of studies will be given based on dynamic modelling in time-space domain. Electrical analysis is then given for bipolar potential generation in a single neuron. This model is brought by studies in unicellular organisms and semiconductor physics. She will present basis of the original models given from knowledge in liquid junctions and dynamic zones induced in cell cytoplasm. Generation of bipolar action potential is needed to compose reliable systems with little power consumption. Unicellular organisms utilize bipolar potentials for motion of cilia of paramecium, tentacle of noctiluca, and so on.. Brief Biography of ...
The introduction [1] of a reliable liquid membrane ion-selective micropipette (ISM) for H+has opened up an important new window onto ion and metabolic homeostasis in brain tissue. Formerly, glass...
Well replacing T and WPump just concern that pipe on backside of water hosing (block) is rusted, and potentially the - Answered by a verified Dodge Mechanic
A man in Thailand has shared a video online of a nine-metre tape worm that he pulled out of his own backside. Kritsada Ratprachoom, 44, had just dropped his daughter off at school when he had the urge to go to the toilet. After finishing his business, he then felt something else still there.
Bob Parkers election promise that the Councils affairs would be more transparent has bitten him on the backside again, says Wigram MP Jim Anderton.
Close The Infona portal uses cookies, i.e. strings of text saved by a browser on the users device. The portal can access those files and use them to remember the users data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser. ...
i was practicing raley cuts last friday. boy, when you cut right you have to fight NOT to do a raley. i can feel now how its done. havent gotten up the balls to try it yet, but i will soon - perhaps this holiday weekend. ,BR, ,BR,like bad said, for me holding the edge right up thru the wake, and keeping my weight more evenly distributed over the board, made all the difference. i was flying off the top of the wake and way out into the flats. pretty fun. ,BR, ,BR,as for rotation - i believe there are two common types - either forward into a front flip, or back towards the way they came, starting to stargaze or launch into a s-bend. the natural rotation when coming off like that is to backside roatation. most people arent doing raley cuts and taking them up like backrolls (which would be frontside rotation). and thats why the s-bend is a raley with a backside 3. its the natural way to go with that trick. like the backside overhead 3 is the natural way to go with a tantrum (whirlybird). ,BR, ...
Potentiometry[edit]. Potentiometry passively measures the potential of a solution between two electrodes, affecting the ... Potentiometry usually uses indicator electrodes made selectively sensitive to the ion of interest, such as fluoride in fluoride ... A variant of potentiometry is chronopotentiometry which consists in using a constant current and measurement of potential as a ... The three main categories are potentiometry (the difference in electrode potentials is measured), coulometry (the cell's ...
Potentiometry Ionspecific electrodes, ionspecific membrands Ionic conductivity Radiometry Nuclear radiation Absorption spectra ...
She has published several science books, including: 1969 - Chemical Applications of Potentiometry 1970 - H2O 1971 - Metals 1975 ... Hazel., Rossotti (1969). Chemical applications of potentiometry. London: Van Nostrand. ISBN 978-0442070489. OCLC 36088. Hazel ...
A variant of potentiometry is chronopotentiometry which consists in using a constant current and measurement of potential as a ... Potentiometry usually uses indicator electrodes made selectively sensitive to the ion of interest, such as fluoride in fluoride ... The three main categories are potentiometry (the difference in electrode potentials is measured), coulometry (the cell's ... doi:10.1016/0045-6535(94)90303-4. Noyhouzer, T.; Valdinger, I.; Mandler, D. (2013-09-03). "Enhanced Potentiometry by Metallic ...
... scanning tunneling potentiometry SXSTM, synchrotron x-ray scanning tunneling microscopy SPE, Scanning Probe Electrochemistry ... "High resolution atomic force microscopy potentiometry". Journal of Vacuum Science and Technology B. 9 (3): 1559-1561. Bibcode: ...
Bürgi, L.; Sirringhaus, H.; Friend, R. H. (2002). "Noncontact potentiometry of polymer field-effect transistors". Applied ...
LCCN 20-20413 Hazel Rossotti, "Chemical applications of potentiometry". London, Princeton, N.J., Van Nostrand, 1969. ISBN 0-442 ...
Bishop (1965-07-01). "Concentration Overpotentials on Antimony Electrodes in Differential Electrolytic Potentiometry". ...
Potentiometry maps give insight into fundamental transport properties, such as the influence of defects on the local electric ... Lüpke, F; Korte, S; Cherepanov, V & Voigtländer, B (2015). "Scanning tunneling potentiometry implemented into a multi-tip setup ... A method giving valuable insight into the charge transport properties of nanostructures is the scanning tunneling potentiometry ...
... scanning tunneling potentiometry (STP), which measures electric potential across a surface; spin polarized scanning tunneling ...
Amperostat Galvanostat Electroanalytical method Voltammetry Potentiometry Coulometry Polarography Bard, A.J.; Faulkner, L.R. ...
Neither potentiometry nor ultraviolet-visible spectroscopy could be used for this determination. Limited precision of chemical ...
Hazel Rossotti, "Chemical applications of potentiometry". London, Princeton, N.J., Van Nostrand, 1969. ISBN 0-442-07048-9 LCCN ...
... both amperometry and potentiometry). In general, CPEs are popular because carbon pastes are easily obtainable at minimal costs ...
... content of samples is determined by atomic absorption spectrophotometry or by potentiometry using ion-selective ...
Hazel Rossotti, "Chemical applications of potentiometry". London, Princeton, N.J., Van Nostrand. {{{1}}}. ISBN {{{2}}}. pp. ...
Ion-selective electrodes ISFET pH electrode Potentiometry Quinhydrone electrode Saturated calomel electrode Silver chloride ...
Malmstadt's major areas of research were in precision null-point potentiometry, emission and absorption spectrochemical methods ...
Other advanced techniques include: Low-Energy Electron Potentiometry: Determining the shift of LEEM spectra allows the ...
... is a set of analytical chemistry methods based on voltammetry or potentiometry that are used ...
... redox potentiometry, and steady-state enzyme kinetics. Following is a table of selected substrates, inducers and inhibitors of ...
... an error affecting measurements made by either flame photometry or indirect potentiometry but not by direct potentiometry. The ...
... which can be detected by potentiometry. The reaction is run in an alcohol solution containing a base, which consume the sulfur ...
They included acid-base titrimetry, electrometric analysis and conductometry, potentiometry, electron transfer, gravimetric ...
"Basics of potentiometry". Metrohm.com. ASTM D4739-11, Standard Test Method for Base Number Determination by Potentiometric ...
... potentiometry, or acidic potassium permanganate chemiluminescence. There are quantitative differences between the two species ...
... an English pioneer of vacuum-tube potentiometry with George Zaidan. "Local Roseworthy Successes". The Mount Barker Courier And ...
16 Test Methods for Determination of Manganese in Iron Ores by Pyrophosphate Potentiometry and Periodate Spectrophotometry ...
... potentiometry MeSH E05.196.922.875 - skin test end-point titration MeSH E05.196.941.336 - centrifugation, density gradient MeSH ...
The four main categories are potentiometry (the difference in electrode potentials is measured), coulometry (the transferred ...
In the most common forms of potentiometry, two different types of electrodes are used. The potential of the indicator… ... Potentiometry: This is the method in which the potential between two electrodes is measured while the electric current (usually ... Other articles where Potentiometry is discussed: chemical analysis: ... In chemical analysis: Potentiometry. This is the method in which the potential between two electrodes is measured while the ...
More Industrial pH meter four-point alarm and a time sharing proportional control HP-960FTP Panel-mount Type pH Meter (Four-Wire Transmission, 4 point ararm, Time sharing Proportional Control). ...
Potentiometry, Nanostructured Materials and the Emergence of Paradigm-Shifting Analytical Platforms† Francisco Javier Andrade ... Andrade FJ, Rius FX, Riu J, Blondeau P, Macho S, Hoekstra R, Cánovas R, Borras M. Potentiometry, Nanostructured Materials and ... "Potentiometry, Nanostructured Materials and the Emergence of Paradigm-Shifting Analytical Platforms." Proceedings 1, no. 8: 795 ... Andrade, F.J.; Rius, F.X.; Riu, J.; Blondeau, P.; Macho, S.; Hoekstra, R.; Cánovas, R.; Borras, M. Potentiometry, ...
Potentiometry and Ion-selective Electrodes (Analytical Chemistry by Open Learning) (9780471913924) by Alun Evans and a great ... For many chemists, potentiometry is the first analytical procedure that they encounter, during the use of an electrode to ... Potentiometry and Ion-selective Electrodes (Analytical Chemistry by Open Learning) ISBN 13: 9780471913924. ... 1. Potentiometry And Ion Selective Electrodes (Part Of Acol Series) (Original Price $ 128.00) Evans ...
Whole virus detection using aptamers and paper-based sensor potentiometry.. Aug 27, 2020 ...
Teaching Application 11 Potentiometry Amino Acid Titrations - Instruments for Electrochemistry Chromatography Electrophoresis ...
Combination of 13C/113Cd NMR, potentiometry, and voltammetry in characterizing the interactions between Cd and two models of ... Home » Combination of 13C/113Cd NMR, potentiometry, and voltammetry in characterizing the interactions between Cd and two ...
1984) Direct determination of cyanide in seawater by ion selective electrode potentiometry. In: 6th Australian Electrochemistry ...
Potentiometry[edit]. Potentiometry passively measures the potential of a solution between two electrodes, affecting the ... Potentiometry usually uses indicator electrodes made selectively sensitive to the ion of interest, such as fluoride in fluoride ... A variant of potentiometry is chronopotentiometry which consists in using a constant current and measurement of potential as a ... The three main categories are potentiometry (the difference in electrode potentials is measured), coulometry (the cells ...
potentiometry. *. In chemical analysis: Ion-selective electrodes. Solid-state ion-selective electrodes use a solid sparingly ...
... Besold J, Reiss G, Hoffmann H (1993) ... Scanning tunneling potentiometry (STP) studies of gold islands on a thin carbon film. Applied surface science, 65-66, p 23-27. ... "Scanning tunneling potentiometry (STP) studies of gold islands on a thin carbon film". Applied surface science 65-66 (1993): 23 ... Besold J, Reiss G, Hoffmann H. Scanning tunneling potentiometry (STP) studies of gold islands on a thin carbon film. Applied ...
1 Redox titrations & potentiometry. (Mark=3) 920316 slides 2 http:\asadipour.kmu.ac.ir 81 slides. Redox reactions 2Fe3+ + Sn2+ ... Download ppt "Redox titrations & potentiometry" * Ppt on statistics and probability Ppt on viruses and bacteria differences Ppt ... Redox titrations 2Fe3+ + Sn2+  2Fe2+ + Sn4+ 2) In electrochemical cell. (Potentiometry) In solution (visual indicators) ... 34 Electrodes and Potentiometry. Potential change only dependent on one ½ cell concentrations Reference electrode is fixed or ...
This second part Potentiometry brings, firstly a sufficient information of experimental technique recommended for ... Milan Meloun, Josef Havel: COMPUTATION OF SOLUTION EQUILIBRIA, Part 2: Potentiometry, Folia Fac. Sci. Nat., Univ. Purkynianae ...
Name some applications of potentiometry. Know the difference between a reference electrode and an indicator electrode. Describe ... Potentiometry Introduction Goals and Objectives Potentiometry Timeline Potentiometric Theory Instrumentation pH Electrodes ... 3 Potentiometry Timeline. Analytical Electrochemistry : Potentiometry Introduction Goals and Objectives Potentiometry Timeline ... Analytical Electrochemistry : Potentiometry Introduction Goals and Objectives Potentiometry Timeline Potentiometric Theory ...
Whole Virus Detection using Paper Potentiometry. Massood Tabib-Azar * and Subhashish Dolai ... How to cite: Tabib-Azar, M.; Dolai, S. Whole Virus Detection using Paper Potentiometry. Preprints 2020, 2020020441 (doi: ... Tabib-Azar, M.; Dolai, S. Whole Virus Detection using Paper Potentiometry. Preprints 2020, 2020020441 (doi: 10.20944/ ... 10.20944/preprints202002.0441.v1). Tabib-Azar, M.; Dolai, S. Whole Virus Detection using Paper Potentiometry. Preprints 2020, ...
Solid electrolyte potentiometry aided study of the influence of the promotors on the phase transitions in copper-oxide ...
Potentiometry based on Ion-Selective Electrode (ISE) * Life Science Techniques * Label-free Detection / Surface Plasmon ...
STUDY OF STABILITY CONSTANTS OF METAL LIGAND COMPLEXES BY POTENTIOMETRY. dc.title.alternative. STUDY OF STABILITY CONSTANTS OF ...
Potentiometry Ionspecific electrodes, ionspecific membrands Ionic conductivity Radiometry Nuclear radiation Absorption spectra ...
Potentiometry: Many chemical reactions produce electric energy, a battery for example. The amount of chemical to produce a ... Potentiometry. Many chemical reactions produce electric energy, a battery for example. The amount of chemical to produce a ...
Point-of-care testing (POCT) enables timely diagnosis and thus improves patient care. Because the many functional components of POCT systems all have to work together perfectly, an interdisciplinary team is required to develop them. Testing the functional components of in vitro diagnostic (IVD) systems often requires complex and costly laboratory setups, even during the development phase. To ensure the smooth integration of individual components and their functionality in the IVD system, we develop customer-specific development and system control boards for optimizing, testing and validating IVD systems as well as their components. ...
Redox Potentiometry. This site contains materials from a lecture course in Biophysics, covering activity, free energy, ... equilibrium constants, and effect of pH on redox potentials, potentiometry, and reaction rates. The redox-specific content is ...
Redox Potentiometry. This site contains materials from a lecture course in Biophysics, covering activity, free energy, ... equilibrium constants, and effect of pH on redox potentials, potentiometry, and reaction rates. The redox-specific content is ...
23.6 Potentiometry.. 24. Electrochemistry and the Environment (Alexander Skundin (Sections 24.1 to 24.4) and Alvin J. Salkind ( ...
The scanning contact potentiometry method was used to locate the rupture zone. Infrared radiation was used to heat the specimen ... Experimental prediction of lead failure under tensile load using scanning contact potentiometry technique. ... Experimental prediction of lead failure under tensile load using scanning contact potentiometry technique. Lett. Mater., 2021, ... title="Experimental prediction of lead failure under tensile load using scanning contact potentiometry technique",. publisher=" ...
8.7 Potentiometry / 319. 8.8 Ion-Selective Electrodes (ISE) / 322. 8.9 Voltammetry / 328 ...
Potentiometry. Conductimetry. Amperometry. Flame ionization. Volta effect. Gas sensitive field effect.. Nuclear magnetic ...
Keywords: electrodeposition; potentiometry; gold nanoparticle; nanoparticle size; protein binding; enzyme activity; ... optimization electrodeposition; potentiometry; gold nanoparticle; nanoparticle size; protein binding; enzyme activity; ...
POTENTIOMETRY. KEY INSTRUMENT COMPONENTS. KEY POINTS/FEATURES. USES. AMPEROMETRY. KEY INSTRUMENT COMPONENTS. KEY POINTS/ ...
Potentiometry and ion selective electrodes by Alun Evans( Book ). 6 editions published in 1987 in English and held by 348 ... potentiometry; Ionic strength adjustors; Calibration; Selectivity; Limits of measurement and response times; Comparison of ... spectroscopy Numerical calculations Optical spectroscopy Phosphorescence spectroscopy Phosphorimetry Polarography Potentiometry ...
  • The three main categories are potentiometry (the difference in electrode potentials is measured), coulometry (the cell's current is measured over time), and voltammetry (the cell's current is measured while actively altering the cell's potential). (wikipedia.org)
  • Electrochemical methods: potentiometry, voltammetry, coulometry. (ucalgary.ca)
  • Complexation of Np(V) with N-methyl-iminodiacetic acid (MIDA) in 1 M NaClO{sub 4} solution was studied with multiple techniques including potentiometry, spectrophotometry, and microcalorimetry. (unt.edu)
  • This site contains materials from a lecture course in Biophysics, covering activity, free energy, equilibrium constants, and effect of pH on redox potentials, potentiometry, and reaction rates. (nottingham.ac.uk)
  • Key Words: Titrations, Potentiometry, Biochemistry. (edaq.com)
  • This second part Potentiometry brings, firstly a sufficient information of experimental technique recommended for potentiornetric (equilibria) titrimetry, secondly, an introduction to analytical aspects of potentiometric titrations, thirdly, an account of frequently used programs in potentiometric equilibria study. (upce.cz)
  • Analytical Electrochemistry : Potentiometry Introduction Goals and Objectives Potentiometry Timeline Potentiometric Theory Instrumentation pH Electrodes Experiments Common Troubleshooting Tips References Potentiometry Timeline Shown below are major milestones in the development of potentiometry. (slideplayer.com)
  • Potentiometric Electrodes and Potentiometry;Chapter 14. (google.it)
  • Potentiometry: reference electrodes, metal indicator electrodes, membrane electrode. (unige.it)
  • Potentiometry usually uses indicator electrodes made selectively sensitive to the ion of interest, such as fluoride in fluoride selective electrodes , so that the potential solely depends on the activity of this ion of interest. (wikipedia.org)
  • Borras, M. Potentiometry, Nanostructured Materials and the Emergence of Paradigm-Shifting Analytical Platforms. (mdpi.com)
  • For many chemists, potentiometry is the first analytical procedure that they encounter, during the use of an electrode to measure pH. (abebooks.com)
  • Highlighted are some case studies of analytical problems which have been solved using potentiometry. (abebooks.com)
  • A variant of potentiometry is chronopotentiometry which consists in using a constant current and measurement of potential as a function of time. (wikipedia.org)
  • Introduction Goals and Objectives Potentiometry Timeline Potentiometric Theory Instrumentation pH Electrodes Experiments Common Troubleshooting Tips References Introduction This module provides an introduction to the measurement technique of potentiometry. (slideplayer.com)
  • VFSF Cl(-) concentration was measured with indirect potentiometry. (nih.gov)
  • Potentiometry passively measures the potential of a solution between two electrodes, affecting the solution very little in the process. (wikipedia.org)
  • Potentiometry was used to compare the solution conformation to the crystal structure. (iucr.org)
  • If you have ever used a pH meter, then you have already performed potentiometry, an electrochemical method in which the potential of an electrochemical cell is measured while little to no current is passed through the sample. (slideplayer.com)
  • Besold J, Reiss G, Hoffmann H. Scanning tunneling potentiometry (STP) studies of gold islands on a thin carbon film. (uni-bielefeld.de)
  • J. Besold, G. Reiss, and H. Hoffmann, "Scanning tunneling potentiometry (STP) studies of gold islands on a thin carbon film", Applied surface science , vol. 65-66, 1993, pp. 23-27. (uni-bielefeld.de)
  • In the most common forms of potentiometry, two different types of electrodes are used. (britannica.com)
  • Solid electrolyte potentiometry aided study of the influence o. (kit.edu)