Pellizzari, E., Bunch, J. E., Bursey, J. T., Berkley, R. E., Sawicki, E., & Krost, K. (1976). Estimation of N-Nitrosodimethylamine Levels in Ambient Air by Capillary Gas-Liquid Chromatography/Mass Spectrometry. Analytical Letters, 9, 579 ...
A method is described for the gas chromatographic-electron-capture detection determination of alkenes via on-column bromination reactions. Pyridinium bromide perbromide (PBPB) was used as the Br2 source, and a cholesterol-glass beads mixture, treated with methanol, was used to remove excess Br2. The optimum ratio of cholesterol to glass beads was found to be 1:10, at which 93% of the bromine released from PBPB can be removed, without removal of the derivitized analytes. The conversion efficiency of alkene to the brominated derivative is extremely low (less than 2%) for ethene, whereas for propene and 1-butene it is 41 and 79%, respectively. For C3---C5 alkenes, this method is 200-300 times more sensitive than analysis of the underivitized analytes by using conventional flame ionization detection.. ...
Article High Resolution Detailed Hydrocarbon Analyses by Capillary Column Gas Chromatography. In the petrochemical industry, samples such as petroleum naphthas and gasolines routinely must be quantitatively separated into their individual components....
An interlaboratory study was organised to validate the preliminary CEN method PrEN 12673: Water Quality - Gas Chromatographic determination of some selected chlorophenols in water. This intercomparison study on three types of water - drinking water, surface water and waste water - comprised a total of nine samples: a high-level, low-level and blank for each of the three types of water. The level of sample was based on the water quality objectives. The variation of the samples with respect to homogeneity and stability of the components appeared after extensive testing to be negligible in comparison with the variation between the results of the participants. In this data set about 7% of the data were detected as statistical outliers and subsequently rejected. For the remaining data set the relative standard deviations for repeatability varied between 5% and 25% and reproducibility between 25% and 55%. Both these ranges comply with the general variation in interlaboratory studies as found by ...
Fatty acids are a widely studied group of lipids of sufficient taxonomic diversity to be useful in defining microbial community structure. The extraordinary resolution of glass capillary gas-liquid chromatography can be utilized to separate and tentatively identify large numbers of fatty acid methyl esters derived from the lipids of estuarine detritus and marine benthic microbiota without the bias of selective methods requiring culture or recovery of the microbes. The gas-liquid chromatographic analyses are both reproducible and highly sensitive, and the recovery of fatty acids is quantitative. The analyses can be automated, and the diagnostic technique of mass spectral fragmentation analysis can be readily applied. Splitless injection on glass capillary gas chromatographic columns detected by mass spectral selective ion monitoring provides an ultrasensitive and definitive monitoring system. Reciprocal mixtures of bacteria and fungi, when extracted and analyzed, showed progressive changes of ...
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D6229 - 06(2010) Standard Test Method for Trace Benzene in Hydrocarbon Solvents by Capillary Gas Chromatography , benzene content, capillary GC, gas chromatography, hydrocarbon solvents, Benzene--paints/related coatings/materials, Capillary gas chromatography, Gas chromatography (GC)--paints/related coatings/materials, Hydrocarbon solvents, Trace elements--paints/related coatings/materials,
TY - JOUR. T1 - The analysis of polyunsaturated fatty acids in meat by capillary gas‐liquid chromatography. AU - Sinclair, Andrew J.. AU - Slattery, William J.. AU - ODea, Kerin. PY - 1982/1/1. Y1 - 1982/1/1. N2 - Polyunsaturated fatty acids (PUFA) of lean meat from domesticated and wild ruminants (cattle, sheep, goat, sambar deer and buffalo) and non‐ruminants (pig, horse and kangaroo) have been examined by capillary gas‐liquid chromatography. Ten different PUFA were found in all specimens with linoleic acid accounting for at least 50% of the total, and arachidonic and linolenic acids being the next most abundant. The total PUFA content for the ruminants ranged from 9 % in beef to 31 % in sambar deer and for the non‐ruminants from 25 % in pig to 43 % in horse. In all species the meat phospholipids (PL) were rich in PUFA (range 24-46% of PL fatty acids), whereas the triglycerides were relatively more saturated (PUFA content range 2-17%). Overall, horse and kangaroo meat had the ...
TY - JOUR. T1 - Whey-protein-coated peanuts assessed by sensory evaluation and static headspace gas chromatography. AU - Lee, S. Y.. AU - Trezza, T. A.. AU - Guinard, J. X.. AU - Krochta, J. M.. PY - 2002/1/1. Y1 - 2002/1/1. N2 - Lipid oxidation is one of the leading causes of deterioration in peanuts. Oxygen concentration plays an important role in oxidation. Oxygen uptake can be impeded by specialized packaging systems or an edible coating, which in turn will decrease the rate of lipid oxidation. Four different formulations of whey-proteinrbased coatings were used to coat the peanuts. The peanut samples were stored in duplicate at 40°C, 50°C, and 60°C, each for storage times of 0, 5, 15, and 45 d. Descriptive analysis results revealed that the rancidity was significantly lower for whey-protein-coated peanuts than for uncoated peanuts. This finding was also confirmed by static headspace GC analysis.. AB - Lipid oxidation is one of the leading causes of deterioration in peanuts. Oxygen ...
China Gas Chromatograph for White Plasticizer with Fid, Find details about China Gas Chromatograph, Chromatograph from Gas Chromatograph for White Plasticizer with Fid - Labmen Instrument Technology Limited
A gas liquid chromatography system for the analysis of complex mixtures of fatty and resin acids has been developed. On 30-40 m long, 0.3 mm ID glass capillary columns coated with 1,4-butanediol succi
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Gas chromatography analysis. Researcher with a gas chromatography machine and autosampler. The machine into which samples are being loaded is a TurboMatrix 650 ATD autosampler. It handles and processes the gas chromatography samples automatically using a process called thermal desorption. Photographed as part of work carried out by the UKs Health and Safety Laboratory (HSL). - Stock Image C026/0582
High molecular weight (HMW) hydrocarbons (defined herein as C35+ compounds) are difficult to characterise by conventional analytical methods. Very few studies have reported precise and reproducible quantification of such compounds in fossil fuels. Nonetheless, such components have important effects on the physical and biological fate of fossil fuels in the geosphere. For example, the phase behaviour of waxy gas condensates is significantly affected by the varying proportions of HMW compounds. Similarly HMW compounds are amongst the most resistant petroleum components to biodegradation. The current study reports the development of reproducible quantitative high temperature capillary gas chromatography (HTCGC) methods for studying both these aspects of the chemistry of HMW hydrocarbons. In addition those hydrocarbons which remain unresolved when analysed by gas chromatography (so called unresolved complex mixtures UCMs) are also studied. UCMs may account for a large portion of the hydrocarbons in ...
TY - JOUR. T1 - Isotopic precision for a lead species (PbEt4) using capillary gas chromatography coupled to inductively coupled plasma-multicollector mass spectrometry. AU - Krupp, Eva Maria. AU - Pecheyran, C AU - Pinaly, H AU - Motelica-Heino, M AU - Koller, D AU - Young, S M M AU - Brenner, I B AU - Donard, O F X PY - 2001/7/31. Y1 - 2001/7/31. N2 - Precision and accuracy of lead isotope ratios of a volatile lead species (PbEt4) were determined by coupling a capillary GC to a magnetic sector multicollector ICP-MS. PbEt4 was prepared by ethylation of a certified lead isotope solution (NIST SRM 981). Coupling was achieved by a transfer line, which allowed simultaneous introduction of a thallium standard solution to correct for mass discrimination. Seven isotopes (Hg-202, Tl-203, Pb-204, Tl-205, Pb-206, Pb-207, Pb-208) were monitored simultaneously with a transient resolution of 50 ms. Pb isotope ratios for the PbEt4 peaks were calculated using transient peak integrals of each isotope signal. ...
TY - CONF. T1 - Principles and Advantages of Programmed Temperature Vaporising (PTV) Injectors for Capillary Gas Chromatography: Large volume injection and other Applications. AU - Janssen, J.G.M.. PY - 1997. Y1 - 1997. M3 - Other. T2 - conference; Shell Houston; 1997-09-01; 1997-09-01. Y2 - 1 September 1997 through 1 September 1997. ER - ...
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You may also wish to search for items by Krupcik. 26 matching references were found. Soják, L.; Krupcík, J.; Janák, J., Gas chromatography of all C15-C18 linear alkenes on capillary columns with very high resolution power, J. Chromatogr., 1980, 195, 1, 43-64, https://doi.org/10.1016/S0021-9673(00)81542-3 . [all data] Krupcik, J.; Leclercq, P.A.; Garaj, J.; Masaryk, J., Analysis of Divalent Metal Dialkyldithiocarbamates by Gas Chromatography and Mass Spectrometry, J. Chromatogr., 1979, 171, 285-304, https://doi.org/10.1016/S0021-9673(01)95308-7 . [all data] Matisova, E.; Krupcik, J.; Cellar, P.; Garaj, J., Quantitative Analysis of Hydrocarbons in Gasolines by Capillary Gas-Liquid Chromatography. I. Isothermal Analysis, J. Chromatogr., 1984, 303, 151-163, https://doi.org/10.1016/S0021-9673(01)96054-6 . [all data] Krupcik, J.; Repka, D.; Benicka, E.; Hevesi, T.; Nolte, J.; Paschold, B.; Mayer, H., Use of Retention Temperatures for the Identification of Phenols Separated on OV-1701 Capillary ...
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Gas liquid chromatography was employed to detect lactic acid in the cerebrospinal fluid of patients suspected of having bacterial meningitis. The technique was found to be both rapid and reliable. Differentiation between aseptic, purulent, and partially treated bacterial meningitis was readily achieved. The effectiveness of therapy in bacterial meningitis was indicated by a rapid fall in the concentration of lactic acid.
Gas chromatographic determination of the fatty acids in the seeds of cottonseed (Gossypium sp.) showed linoleic, palmitic, oleic, and stearic acids, with linoleic acid being the major component. Changes in the composition of fatty acids during various stages of germination were measured in the cotyledons and in the roots. A decrease in the content of all the fatty acids and an 8-fold increase in the moisture content of the cotyledons were observed during the 10 days of germination. There were no significant changes in the fatty acid contents of the roots with the exception of those in linoleic acid which increased by 50% during 4-10 days of germination. The possible significance of these changes is discussed. ...
Helium vs. hydrogen as a carrier gas in capillary Gas ChromatographyTrade NewsAfter the expense of a new gas chromatograph, the last thing any chemist wa...
The main sources of error in chromatographic analysis are described, particular attention being drawn to variable bias. This is one of the major potential sources as it is not easily detected. A...
You may also wish to search for items by Uralets, V. and Uralets. 7 matching references were found. Golovnya, R.V.; Uralets, V.P.; Kuzmenko, T.E., Characterization of fatty acid methyl esters by gas chromatography on siloxane liquid phases, J. Chromatogr., 1976, 121, 1, 118-121, https://doi.org/10.1016/S0021-9673(00)82312-2 . [all data] Rodchenkov, G.M.; Uralets, V.P.; Semenov, V.A.; Leclercq, P.A., Analysis of Dexamethasone, Triamcinolone, and Their Metabolites in Human Urine by Microcolumn Liquid and Capillary Gas Chromatography Mass Spectrometry, J. Hi. Res. Chromatogr. Chromatogr. Comm., 1988, 11, 3, 283-288, https://doi.org/10.1002/jhrc.1240110312 . [all data] Uralets, V.P.; Semenova, V.A.; Yakushin, M.A.; Semenov, V.A., Analysis of anabolic steroids in body fluids by capillary gas chromatography with a two-channel detection system and a computer, J. Chromatogr., 1983, 279, 695-707, https://doi.org/10.1016/S0021-9673(01)93675-1 . [all data] Rodchenkov, G.M.; Uralets, V.P.; Semenov, V.A., ...
A method is described for the adsorption on charcoal and desorption with carbon-disulfide (75150) for gas chromatographic determination of 2-butanone (78933). Data are given on the principle, range and sensitivity, interference, precision, accuracy, advantages and disadvantages of the method. Also described are the apparatus, reagents and procedure used; analysis of samples; determination of desor
biological samples. J. Chromatogr. 246, 81-87. 2. ANDERSON, R.L. (1983): Toxicity of fenvalerate and permethrin to several non- target aquatic invertebrates. Environ. Entamol. 11, 1251-1257. 3. ARGAUER, R.J., K.J. ELLER, M. P. RICHARD and T. BROWN RICHARD (1997): Determining ten synthetic pyrethroids in lettuce and ground meat by using ion-trap mass spectrometry and electron capture gas chromatography. J. Agric. Food Chem. 45, 180-184. 4. ARGAUER, R.J., K.I. ELLER, M.A. IBRAHIM and R.J. BROWN (1995): Determining propoxur and other carbamates in meat using HPLC fluorescence and gas chromatography/ion-trap mass spectrometry after supercritical fluid extraction. J. Agric. Food Chem. 43, 2774-2778. 5. BRAUN, H.E. and J. STANEK (1982): Application of the AOAC multi-residue method to determination of synthetic pyrethroid residues in celery and animal products. J. AOAC. 65, 685-689. 6. CHEN, Z. M. and Y. H. WANG (1996): Chromatographic methods for the determination of pyrethroid pesticide residues in ...
PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
GlobalSpec Product Announcement for 1500XA Gas Chromatograph - The Rosemount Analytical 1500XA Gas Chromatograph combines the proven analytical components of a field-mounted GC with the larger oven capacity of a traditional air-bath oven design. Used in gas processing plants, it is specially designed for trace sulfur, trace hydrocarbon, and other high temperature applications.
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Docosahexaenoic acid (DHA) in infant formula at concentrations based on worldwide human milk has resulted in circulating red blood cell (RBC) lipids related to visual and cognitive development. In this study, infants received study formula (17mg DHA/100kcal) with a commercially-available (Control: n=140; DHASCO®) or alternative (DHASCO®-B: n=127) DHA single cell oil from 14 to 120 days of age. No significant group differences were detected for growth rates by gender through 120 days of age. Blood fatty acids at 120 days of age were assessed by capillary column gas chromatography in a participant subset (Control: n=34; DHASCO-B: n=27). The 90% confidence interval (91-104%) for the group mean (geometric) total RBC DHA (µg/mL) ratio fell within the pre-specified equivalence limit (80-125%), establishing study formula equivalence with respect to DHA. This study demonstrated infant formula with DHASCO-B was safe, well-tolerated, and associated with normal growth. Furthermore, DHASCO and DHASCO-B ...
Agarwal N, Kewalramani N, Kamra D N, Agarwal D K and Nath K 1991 Hydrolytic enzymes of buffalo rumen: comparison of cell free fluid, bacterial and protozoal fractions. Buffalo Journal 7: 203-207. AOAC (Association of Official Analytical Chemists) 1995 Official Methods of Analysis, 16th edition; AOAC: Arlington, VA, USA. Bradford M M 1976 A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. Analytical Biochemistry 72: 248-254. Cottyn B G and Boucque C V 1968 Rapid method for the gas-chromatographic determination of volatile fatty acids in rumen fluid. Journal of Agriculture and Food Chemistry 16: 105-107. Dehority B A 2005 Ciliate protozoa. In Methods in Gut Microbial Ecology for Ruminants, edited by H P S Makker and C S Mc Sweeney, IAEA, pp 67-78 ...
A new method for sampling and chemical analysis of alphacypermethrin in workplace air has been described. Air samples were taken using a glass tube filled with silica gel with chemically bounded octadecyl phase. Chromatographic determinations were conducted using an HP-5 capillary column (10 m x 0.53 mm) and an electron-capture detector. Alphacypermethrin recovery was 100.15%. The calculated detection limit for a 60-L air sample was 0.0001 mg/m3 ...
Learn how headspace analysis and GC/MS analysis helped the FDA identify and quantify the carcinogen Benzene in soft drinks in a blog from Innovatech Labs.
TY - JOUR. T1 - Optimization of temperature programming in gas chromatography with respect to separation time. II. Optimization of the individual temperature programme substrategies. AU - Bartu, V.. AU - Wicar, S.. AU - Scherpenzeel, G.J.. AU - Leclercq, P.A.. PY - 1986. Y1 - 1986. N2 - The temperature programme optimization substrategies for a mixture with non-intersecting retention time approximation functions are described. For mixtures of compounds whose elution functions intersect, the determination of strategies for possible solutions and of the corresponding substrategies for temperature programme optimization is derived. Heuristic methods for the minimization of the retention times of the most difficult to separate component pairs are presented. Further, the calculation of retention times and peak widths for optimization purposes is discussed.. AB - The temperature programme optimization substrategies for a mixture with non-intersecting retention time approximation functions are ...
D5317 - 98(2017) Standard Test Method for Determination of Chlorinated Organic Acid Compounds in Water by Gas Chromatography with an Electron Capture Detector , electron capture, gas chromatography, herbicides, organic acid,,
The latest market report published by Credence Research, Inc. Gas Chromatography In Medical Applications Market - Growth, Future Prospects, Competitive Analysis, 2017 - 2025, the global gas chromatography in medical applications market was valued at US$ 2,486.94 Mn in 2016, and is expected to reach US$ 4,381.11 Mn by 2025 expanding at a CAGR of 6.25 % from 2017 to 2025.. Browse the full report Gas Chromatography In Medical Applications Market - Growth, Future Prospects, Competitive Analysis, 2017 - 2025 at http://www.credenceresearch.com/report/gas-chromatography-in-medical-applications-market. Market Insights. Gas chromatography is a matured market and provides tremendous opportunity for innovations in the design and operation aspects of gas chromatography. Challenges faced by many lab managers operating gas chromatography are insidious leaks and column trimming. Frequent innovations (Agilent Technologies) has resulted in replacing nuts and ferrules which earlier made connections for flow ...
This course looks at analytical columns for gas chromatography in detail, GC Detectors, mass spectrometry principles and the data generated; the types of mass spectrometers available that are hyphenated to GC; their vacuum systems, ionisation techniques, mass filters and detectors.
Sigma-Aldrich offers a number of SUPELCOWAX® 10 Capillary GC Column products. View information & documentation regarding SUPELCOWAX® 10 Capillary GC Column, including CAS, MSDS & more.
The 4-day Comprehensive GC Training course introduces the fundamental theory of GC along with the operation, maintenance and troubleshooting of the Thermo TRACE Gas Chromatograph using Xcalibur software.
Common oven temperatures (such as terms: cool oven, very slow oven, slow oven, moderate oven, hot oven, fast oven, etc.) are set to control the effects of baking in an oven, for various lengths of time. The various standard phrases to describe oven temperatures include words such as cool to hot or very slow to fast. For example, a cool oven has temperature set to 90°C (200°F), and a slow oven has a temperature range from 150-160°C (300-325°F). A moderate oven has a range of 180-190°C (350-375°F), and a hot oven has temperature set to 200-230°C (400-450°F). A fast oven has a range of 230-260°C (450-500°F) for the typical temperature. Conversion of units Gas Mark (Regulo) SI Units SI Units: Temperature, U.S. National Institute of Standards and Technology (NIST), U.S. Commerce Department, February 11, 2011, web: NIST-Temp: accessed 2011-03-26 ...
oven temperature off MY hotpoint RGB745 gas ovens temperature is off, sometimes as much as 200 degrees. It seems - Hotpoint RGB745 Gas Kitchen Range question
article{47fc4f1e-2c18-4477-8507-2504703b8b7e, abstract = {,p,Despite the maturity reached by targeted proteomic strategies, reliable and standardized protocols are urgently needed to enhance reproducibility among different laboratories and analytical platforms, facilitating a more widespread use in biomedical research. To achieve this goal, the use of dimensionless relative retention times (iRT), defined on the basis of peptide standard retention times (RT), has lately emerged as a powerful tool. The robustness, reproducibility and utility of this strategy were examined for the first time in a multicentric setting, involving 28 laboratories that included 24 of the Spanish network of proteomics laboratories (ProteoRed-ISCIII). According to the results obtained in this study, dimensionless retention time values (iRTs) demonstrated to be a useful tool for transferring and sharing peptide retention times across different chromatographic set-ups both intra- and inter-laboratories. iRT values also ...
A gas chromatograph having a carrier gas feed for a pressure-controlled feeding of a carrier gas stream, which feed leads to a sample applicator having preliminary separation which is connected to a b
Gas chromatography, first established in the 1950′s, is a mature analytical technique with many established applications. Therefore, it is probable that documented methods or journal articles exist stating which stationary phases have successfully been used for a given application. Today, GC is the preferred chromatographic technique in the environmental, petroleum, chemical, flavor & fragrance, and forensic industries. In the biofuel, agriculture, food & beverage, cosmetic and personal care/cleaning product, and clinical industries, its frequency of use is equal to other chromatographic techniques. It is used for specific chromatographic applications in the industrial hygiene, pharmaceutical, and life science industries.We have identified the GC columns that are routinely used in the various industries. These are conveniently arranged by industry, and then application within that industry, to simplify the process of selecting the proper phase. First, follow the link that matches your
Journal of Chemistry is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles on all aspects of fundamental and applied chemistry.
The program offers a wide array of research equipment and facilities, including the following: Hewlett Packard gas chromatograph (mass spectral detector) with HP headspace injector; Hewlett Packard gas chromatograph (FID) with Tek-Mar headspace injector; Hewlett Packard HP Chemstation analytical software; Gow-Mac gas chromatograph (TCD); Hewlett Packard gas chromatograph (FPD); Neotronics Electronic Nose 4000; -70C freezer; deionized and distilled water equipment; Kjeldahl nitrogen analyzers; BYK-Gardner Spectrocolorimeter; Seward stomacher 400 laboratory blender; colony counters; rapid PCR analytical equipment; HPLC-MS sensory analysis facility; a food-science teaching laboratory; state-of-the-art culinary preparation equipment and bench research facilities.. Once in the program, you will have access to the research facilities of several departments, including the Department of Agricultural and Biological Engineering, the Department of Animal and Veterinary Sciences, the Department of Food ...
ASTM-E260 Standard Practice for Packed Column Gas Chromatography - gas chromatography; GC; packed columns ; Chemical analysis; Gas chromatography (GC); Gases; Organic chemicals; Packed column gas chromatography; Supercritical fluid chromatography (SFC); Vaporizable organic/inorganic mixtures
Tauro-7 alpha, 12 alpha-dihydroxy-5 beta-cholanic acid has been used as internal standard in the gas-liquid chromatographic analysis of bile acid methyl ester acetates. The advantage of this compound over other internal standards is that its use takes into account the hydrolysis rate of the bile acids. The entire procedure is monitored by thin-layer chromatography, gas-liquid chromatography, and by radioactivity measurement and zonal scanning.
Shellie, Robert, Mondello, Luigi, Dugo, Giovanni and Marriott, Philip 2004, Enantioselective gas chromatographic analysis of monoterpenes in essential oils of the family Myrtaceae, Flavour and fragrance journal, vol. 19, no. 6, Nov/Dec, pp. 582-585, doi: 10.1002/ffj.1368. ...
Detectors for use with capillary columns must have high sensitivities due to the limited sample size that can be used whith such columns. In addition, due to the very small peak volumes produced by the column, the sensing volume must also be extremely small. As the flame ionization detector (FID) is mass sensitive as opposed to concentration sensitive (see book 4 of this series for the meaning of mass and concentration sensitivity) the dilution by hydrogen does not effect the detector response. Thus, the FID has both the high sensitivity and the small sensor volume that is necessary and is, consequently, ideal for use with capillary columns. The nitrogen phosphorous detector (NPD) is also appropriate for capillary columns (the function of which is very similar to that of the FID) for the same reason. The micro-argon detector employs a scavenger flow which also, in effect, reduces the sensor volume, so this detector can also be used with capillary columns. The FID and the NPD detector will be ...
Jet Contact Spring for External Igniter and Auto-Ignite Flame Ionization Detector (FID) for the PerkinElmer AutoSystem/AutoSystem XL, and the Nitrogen Phosphorus Detector (NPD) for the PerkinElmer Series/Sigma 2000 Series GCs
Jet Contact Spring for External Igniter and Auto-Ignite Flame Ionization Detector (FID) for the PerkinElmer AutoSystem/AutoSystem XL, and the Nitrogen Phosphorus Detector (NPD) for the PerkinElmer Series/Sigma 2000 Series GCs
The intrinsically safe, portable MicroFID II Flame Ionization Detector (FID) is designed for HAZMAT detection, confined space entry and soil gas monitoring. MicroFID II provides measurements over a wide range of VOCs, including methane. Its operating range of 0.1 ppm to 50,000 ppm helps better define the severity of the hot zone. When sampling in an unknown, potentially explosive environment, responders can be confident the area can be safely entered with measurement information provided by the instrument ...
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GC-FID/TCD. Gas Chromatograph-Flame Ionization Detector / Thermal Conductivity Detector. Location: ER-4006. This Agilent 6890A GC is equipped with a FID and TCD in series. Sample introduction is via a Gerstel Multi Purpose Sampler, which can handle both liquid and gaseous samples. The GC-FID/TCD is mainly used for the quantification of permanent gases, such as CO2, H2, and CH4.. GC-FID/ECD. Gas Chromatograph-Flame Ionization Detector / Electron Capture Detector. Location: ER-4006. This GC is an Agilent 6890A model with a FID and ECD in parallel. It is used with a Gerstel Multi Purpose Sampler, which can handle both liquid and gaseous samples. This GC is mainly used for quantification of fatty acids (as methyl esters) and of hydrocarbons, and for headspace analysis of volatile organic contaminants (e.g. BTEX) in aqueous solutions. It is also used in combination with the preparative fraction collector.. Preparative Fraction Collector. Location: ER-4006. The GC-FID/ECD is interfaced with a Gerstel ...
Volatile fatty acids produced in Robertsons cooked meat medium by a range of clinically relevant anaerobes were compared by gas liquid chromatography with those produced in blood agar. The same volatile fatty acid profiles were obtained in both media, although the concentration of acids was lower in blood agar. We conclude that detection of volatile fatty acids from a pure culture of an organism on solid medium is practicable and offers advantages over the conventional technique.. ...
TY - JOUR. T1 - Microscale preparation of pentafluorobenzyl esters. Electron-capture gas chromatographic detection of indole-3-acetic acid from plants. AU - Epstein, Ephraim. AU - D. Cohen, Jerry. N1 - Funding Information: Pulsed positive/negative-ion MS data were provided by Dr. R. W. K. Chapman, Finnigan Corporation, 1383 Piccard Dr., Suite 100, Rockville, MD 20850, U.S.A., and Ms. A. Schulze, Ms. P. J. Hall and Ms. S. D. Cohen assisted with GC-SIM-MS. This work was supported by U.S.-Israel Binational Agricultural Research and Development grant I-5-79 to E.E. and to Dr. R. S. Bandurski and, in part, by National Science Foundation grant PCM 79-04637 and National Aeronautics and Space Administration grant NAGW-97, ORD25796 to Dr. R. S. Bandurki. This is contribution No. E-306, 1980 series, from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel and is Journal article 9723 from the Michigan Agricultural Experiment Station.. PY - 1981/5/22. Y1 - 1981/5/22. N2 - A ...
This study was conducted at the Horticulture Department of Cukurova University, Adana, Turkey, in 2010 to determine the volatile aroma compounds of Morchella mushroom. Fresh samples of Morchella esculenta (Sample 1) and Morchella elata (Sample 2) were collected from Canakkale (Sample 1) and Mersin (Sample 2) provinces in Turkey in the spring of 2010. Volatile aroma compounds were analyzed by headspace gas chromatography mass spectrometry (HS-GC/MS). A total of 31 aroma compounds were identified in the 2 analyzed samples: 7 alcohols, 7 esters, 7 ketones, 3 acids, 2 aldehydes, 1 terpene, phenol, 1-propanamine, geranyl linalool, and quinoline. Seventeen aroma components were identified in Sample 1, and 18 compounds were found in Sample 2. Phenol was determined as the major aroma compound in both Sample 1 and Sample 2, at 50.888% and 58.293% content, respectively. Alcohols, especially 1-octen-3-ol, were detected as the second major aroma components in Sample 1 and Sample 2, at 15.500% and 5.660% ...
Starch index and internal ethylene were measured on a total of 10 fruit per orchard each year. Soluble solids concentration was measured using a handheld temperature-compensated refractometer (Fisher Scientific, Nepean, Ontario, Canada) on fruit in Ontario, but not in Maine. Starch staining with iodine was measured using a visual rating in which 1 = all starch remaining and 8 = no starch (Blanpied and Silsby, 1992). To measure internal ethylene concentration (IEC) in Maine, a 25-mm-long stainless steel needle with a syringe was inserted through the calyx end to remove 1 mL of gas, which was injected into a gas chromatograph with a flame ionization detector (Shimadzu GC-8A, Kyoto, Japan). The gas chromatograph was fitted with a 450 × 3-mm stainless steel column packed with activated alumina. Operating conditions were as follows: oven temperature was 80 °C, injector temperature was 200 °C, and flame ionization detector temperature was 200 °C. IEC was measured in Ontario by withdrawing a 3-mL ...
A method is described for the absorption on charcoal and desorption with carbon-disulfide for gas chromatographic determination of 1,1- dichloro-1-nitroethane (594729) in the air. Data are given on the principle, range and sensitivity, precision, accuracy, advantages and disadvantages of the method. Also described are the apparatus, reagents and procedure used; analysis of samples; interferences;
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An automatic flow injection (FIA) and two possible reference gas chromatographic (liquid and headspace sampling GC) methods including appropriate sample preparation were developed and validated for determination of acetone in milk. The methods were tested by preserved raw milk samples. The FIA results were compared with data obtained by GC determinations. It was found that FIA procedure is suitable for rapid automated measurement of acetone in the range of 0-5 mmol l-1 in milk, therefore it is a promising analytical method for ketosis monitoring in dairy farms. ...
The GC-FID (Gas Chromatograph - Flame Ionization Detector) works by injecting a sample into a column (tube) which is then heated in an oven. The evolution from the stationary phase (solid or liquid) to the mobile phase (gas) is measured as it moves through the column and the flame ionization detector. This technique measures the amount of each compound found in the sample, and our software delivers the results as peaks on a graph as they are reflected at varying temperatures over time. The area under the curve is measured and compared to the calibration, resulting in accurately quantified testing.. ...
Public tender in Salisbury. Supply of two Agilent 7890B Series gas chromatography mass spectrometry flame photometric detection systems. Supply of two Agilent 7890B Series gas chromatography mass spectrometry flame photometric detection systems. voluntary ex ante transparency notice
ICP-MS is very sensitive and has limited matrix effects when used as an element-specific detector for GC in order to identify volatile metal or metalloid species, GC-MS is not very sensitive or selective in the electron ionization (EI) mode, but provides molecular information about volatile species. In this work, an ion trap EI-MS-MS and an ICP-MS system were used as two different detectors for the same GC system to provide complementary information about volatile organometallic species in the complex matrices of landfill and sewage sludge fermentation gases. A simple robust GC separation method with cryotrapping was adequate for the separation of the different metal(loid) containing volatile compounds, and was directly coupled to the ICP-MS system, In addition, gas samples from this GC system were collected in evacuated vials. These fractions were further separated on a capillary column and detected in an ion trap mass spectrometer. For the first time, parent ions, fragmentation patterns, ...
New Gas Chromatography Mass Spectrometry (GC-MS) Systems | GMI, Dont waste your money on your next Gas Chromatography System purchase. Download GMIs Gas Chromatography Guide and become an expert on acquiring excellent quality equipment by learning how to:   Select the right system based on expected throughput. Differentiate sample introduction systems to suit your required injection techniques. Pick out the proper GC Column for your Gas Chromatograph equipment. Choose between detector types according to selectivity or dependency. Dont waste your time and money on the wrong equipment. Download the guide today, click here.   Browse through and learn more about a specific New Gas Chromatography, Detector or System by clicking on the product name below. For any inquiries and/or concerns, just contact our new lab equipment experts via our hotline at 1-800-745-2710 or email us at [email protected]
With the aim to reinforce laboratory competence in the field of testing the quality of fish from aquaculture, a study on the precision of fatty acid (FA) analyses in fish meat and fish feed was undertaken. Different methods were performed in laboratories. In situ transesterification method and extraction of lipids from the fish were followed by capillary gas chromatography with flame ionization detection. The reproducibility (R) values of the majority of FAs were less than 3% of their absolute values. Differences in calculating ionization detector response factors and/or autoxidation caused by faulty sample-handling could lead to variation in quantification of FAs in fish, especially for FA C22:6n-3. Statistical analysis showed a significant correlation between the two laboratories quantifications of FAs in fish and fish feed (Pearsons correlation coefficient; r = 0.987, r = 0.994, and r = 0.997; for fish Z [trout], fish Š [rainbow trout], and fish feed, respectively). Overall, adequate ...
A review on the use of packed capillary columns in gas chromatography (GC) is presented. Several articles on the invention of packed capillary columns have been published, as well as on the progress and the development of this technology. Practical applications by this technique have also been studied, especially in the period from 1996 and onwards. A recently developed technique, solvating gas chromatography (SGC), which uses CO2 as the mobile phase combined with a high inlet pressure, has received specific focus.. The use of packed capillary columns in GC has also been evaluated. The technique used to pack these columns has been developed from a similar technology, which have been used for packing of columns, achieving very good separations, for both supercritical fluid chromatography (SFC) and high performance liquid chromatography (HPLC). In the present work, the possibilities of using packed capillary columns in GC, without applying a higher inlet pressure than 5 bar, has been explored. A ...
A piece of equipment used in gas chromatography that uses a flame to decompose the neutral solute molecules into charged particles, then measures any changes in conductivity ...
Browse our extensive catalog of new & used Gas Liquid Chromatograph Equipment for sale or auction. Find any required new, refurbished or used Gas Liquid Chromatograph Equipment or device.
Browse our extensive catalog of new & used Gas Liquid Chromatograph Equipment for sale or auction. Find any required new, refurbished or used Gas Liquid Chromatograph Equipment or device.
Pipet 100.0 mg of standard solution or sample solution into a glass tube fitted with a screw cap and add 100.0 mg of internal standard solution. Remove the water by lyophilization and dissolve the residue in 1.0 ml of pyridine. Add 4 mg O-benzyl-hydroxylamine hydrochloride, and cap the tube and set it aside for 12 h at room temperature. Then, add 1 ml of N-methyl-N-trimethylsilyl-trifluoroacetamide (MSTFA) and heat to 80º for 12 h shaking occasionally and allow to cool. Inject 1 µl portions of these solutions directly into a gas chromatograph under the following operating conditions with helium as carrier gas (initial flow rate: approx. 1 ml/min at 80º and 1 atm; split flow: 25 ml/min):. Column: Fused silica HT-8 (25 m x 0.22 mm x 0.25 µm), or equivalent. Injector: Programmed temperature vaporizer: 30º; 270º/min to 300º (49 min). Detector: Flame ionization detector; 360º. Temperature program: 80º (3 min); 10º/min 80º (3 min); 10º/min to 210º; 5º/min to 350º (6 min). Approximate ...
Significant findings. Conventional chemical analyses for volatile insect pheromones usually involve the use of a gas chromatograph (GC). The GC separates individual chemical components in the complex mixture. Each separate compound is then usually quantified using a flame ionization detector (FID). This detector basically burns and ionizes all the carbon in each separated chemical component. This method of analysis requires a relatively large chemical concentration to acquire a good signal for quantitation. Besides being insensitive, this form of ionization detection is nonspecific and not useful for assessing very low but bioactively significant pheromone concentrations that result in mating disruption in apple and pear orchard air.. Our preliminary method development findings using the GC/MS/CI show that both the electron impact (EI) and chemical ionization (CI) modes on the mass spectrometer have greatly enhanced sensitivity for codlemone quantitation compared to conventional GC/FID ...
ENGLISH ABSTRACT: Even capillary gas chromatography does not always give complete separation of the components of complex mixtures. During the last few decades several two-dimensional gas chromatographic techniques were ...
Analusis, a European journal on Analytical Chemistry, is published under the auspices of the Société Française de Chimie, the Société de Chimie Industrielle and the Gesellschaft Deutscher Chemiker
Quality Environmental Test Chambers manufacturers & exporter - buy Hplc Gas Chromatograph Mass Spectrometry Analyzer Machine GLPC / GC from China manufacturer.
However, the most interesting parts of this exhibition, as of Lovelocks new book A Rough Ride to the Future (Allen Lane, 2014) dont have anything to do with Gaia or climate change. They are about Lovelock the inventor. This is what makes Lovelocks career not merely productive and interesting but remarkable. He has invented over a hundred useful devices, including the electron capture detector that enabled him to detect small traces of chlorofluorocarbon (CFC) gases in the atmosphere in the late 1960s, leading to a realization that these industrial reagents (used as refrigerants) were gradually accumulating and could, once they reached the frigid stratosphere over the poles, undergo chemical reactions that destroy ozone, the planets protective screen against harmful ultraviolet radiation from the sun. Lovelock also claims to have invented the first microwave oven, which he used to defrost hamsters frozen for experiments during his early stint at the Medical Research Council. Several of these ...
However, the most interesting parts of this exhibition, as of Lovelocks new book A Rough Ride to the Future (Allen Lane, 2014) dont have anything to do with Gaia or climate change. They are about Lovelock the inventor. This is what makes Lovelocks career not merely productive and interesting but remarkable. He has invented over a hundred useful devices, including the electron capture detector that enabled him to detect small traces of chlorofluorocarbon (CFC) gases in the atmosphere in the late 1960s, leading to a realization that these industrial reagents (used as refrigerants) were gradually accumulating and could, once they reached the frigid stratosphere over the poles, undergo chemical reactions that destroy ozone, the planets protective screen against harmful ultraviolet radiation from the sun. Lovelock also claims to have invented the first microwave oven, which he used to defrost hamsters frozen for experiments during his early stint at the Medical Research Council. Several of these ...
In this application note a completely automated method for analyzing and quantifying VOCs in food packaging materials is presented. The combination of sample preparation steps and an analytical step in the same sequence allows high accuracy in quantification, high sample throughput, and minimizes error-prone manual manipulations. Detection and quantification are performed by means of a gas chromatograph (GC) coupled with a single quadrupole mass spectrometer (MS).
In this application note a completely automated method for analyzing and quantifying VOCs in food packaging materials is presented. The combination of sample preparation steps and an analytical step in the same sequence allows high accuracy in quantification, high sample throughput, and minimizes error-prone manual manipulations. Detection and quantification are performed by means of a gas chromatograph (GC) coupled with a single quadrupole mass spectrometer (MS).
0159]1. Cynthia Q Sun et al (Chemico-Biological Interactions 140 (2002), pp 185-198). [0160]2. R. Corinne Sprong et al (Antimicrobial Agents and Chemotherapy, April 2001, pp 1298-1301). [0161]3. Schuster et al (Pharmacology and Therapeutics in Dentistry 5: pp 25-33; 1980) [0162]4. Gudmundur Bergsson et al (Antimicrobial Agents and Chemotherapy, November 2001, pp 3209-3212). [0163]5. Yong-Ching Yang et al. J. Chin. Inst. Chem. Engrs., Vol 34, No 6, 617-623. A Process for Synthesis of High Purity Monglyceride [0164]6. Catrienus DeJong and Herman T. Badings 1990. Determination of free fatty acids in milk and cheese, procedures for extraction, clean up and capillary gas chromatographic analysis. Journal of high resolution chromatography, Vol. 13, February 1990. Pages 94-98. [0165]7. Halldor Thormar et al (Antimicrobial Agents and Chemotherapy; January 1987, pp 27-31) This author reports the growth inhibitory properties of various free fatty acids against Enterococci, which are gram-positive, and ...
The Thermo Scientific TVA-1000B Toxic Vapor Analyzer is the only over- the shoulder portable vapor analyzer that offers both Flame Ionization Detection (FID) and Photo Ionization Detection (PID) in a single, easy-to-use instrument.
2D-GC allows for more precise separation of polar components (cyclical hydrocarbons, aromatic compounds and FAME) from the non-polar paraffins. For comparing the results from 2D-GC gas chromatography, standardized methods such as DIN EN 12916 (aromatic distribution in diesel fuels), ASTM D 2887 (simulated distillation), DIN EN 14078 (FAME-content) as well as DIN EN 14331 (methyl ester distribution in FAME-blends) can be consulted.. 2-dimensional gas chromatography analysis is available globally. Test samples can be easily shipped to the laboratory for prompt handling from European and global clients.. ...
BACKGROUND: The chemical composition of Amazonian fish is extremely variable, being influenced by the season and the type and amount of food. A special interest in the fish oil composition has been developed owing to the presence of essential fatty acids, since this is directly related to human health. This study aimed to investigate the fatty acid composition (FAC) of the total lipid (TL), neutral lipid (NL) and phospholipid (PL) fractions of the dorsal muscle and orbital cavity of farmed and wild matrinxã in the Amazon area captured in different seasons. RESULTS: Fatty acids (FA) were analysed by high-resolution gas chromatography/mass spectrometry. Sixty-five FA were detected in the TL, 66 in the NL and 55 in the PL. The main FA found in farmed and wild fish were oleic, palmitic, stearic and linoleic acids. No distinctions in the quality or quantity of these fractions between dorsal muscle and orbital cavity were found. CONCLUSION: The season had a significant influence on the TL and FAC. ...
Short-chain fatty acids (SCFAs) are gut microbiota metabolites recognized for their beneficial effects on the host organism. In this study, a simple and rapid sample preparation method combined to SCFAs analysis by direct injection and gas chromatography coupled with flame ionization detection (GC-FID), for the determination and quantification of eight SCFAs (acetic, propionic, i-butyric, butyric ...
Short-chain fatty acids (SCFAs) are gut microbiota metabolites recognized for their beneficial effects on the host organism. In this study, a simple and rapid sample preparation method combined to SCFAs analysis by direct injection and gas chromatography coupled with flame ionization detection (GC-FID), for the determination and quantification of eight SCFAs (acetic, propionic, i-butyric, butyric ...