AnatomyOrganismsDiseasesChemicals and DrugsAnalytical, Diagnostic and Therapeutic Techniques and EquipmentPhenomena and ProcessesDisciplines and OccupationsTechnology, Industry, AgricultureInformation ScienceHealth Care
GasesHeliumChromatography, GasGas Chromatography-Mass SpectrometryAnesthetics, InhalationHydrogenHydrogen BondingHydrogen PeroxideChromatography, High Pressure LiquidHydrogen SulfideChromatography, AffinityChromatography, GelChromatographyChromatography, Ion ExchangeChromatography, Thin LayerChromatography, LiquidCarrier StatePulmonary Gas ExchangeNoble GasesBlood Gas AnalysisGas PoisoningDrug CarriersCarrier ProteinsMolecular Sequence DataKineticsMolecular WeightAmino Acid SequenceMass SpectrometryChromatography, DEAE-CelluloseHydrogen-Ion ConcentrationElectrophoresis, Polyacrylamide GelGas, NaturalAcyl Carrier ProteinHeterozygote DetectionChromatography, AgaroseOxidation-ReductionGas GangreneHeterozygoteModels, MolecularHydrogen CyanideAmino AcidsOil and Gas FieldsOxygenMagnetic Resonance SpectroscopySubstrate SpecificityReduced Folate Carrier ProteinCattleEscherichia coliCarbon DioxideChromatography, Reverse-PhaseMutationTemperatureMolecular StructureChromatography, PaperChemistrySpectrophotometry, UltravioletProtein ConformationSpectrometry, Mass, Electrospray IonizationBinding SitesChemical PhenomenaProtein BindingBase SequenceWaterCatalaseOxidantsBacterial ProteinsTime FactorsRecombinant ProteinsMustard GasStereoisomerismDeuterium Exchange MeasurementSolventsModels, ChemicalTandem Mass SpectrometryMethanePeptidesCrystallography, X-RayCarbohydratesSepharoseLiverRabbitsIndicators and ReagentsSolubilityMethodsDrug StabilityCatalysisFatty AcidsSulfidesReproducibility of ResultsCalibrationPeptide FragmentsChemical FractionationHydrogenaseProteinsHydrolysisCystathionine gamma-LyasePeroxidasesCloning, MolecularCarbohydrate SequenceHot Temperature
HeliumLiquid chromatographyMixturesHydrocarbonsCarbon monoxideCompoundsArgonMethaneNitrogenAnalytical2022ChromatographDetectionProcessesHeadspaceInertSpeciesSeparationSignificantlySuitableCylinder gasConcentrationConsiderationsYearsDetectorsWorkDeliveriesChemicalWaterColumnFlow ratesSystemTechniquesSafetyFormImportantMakeRequirementsNaturalMaterialAnalysisServiceSourcesAlternative
Helium11
  • Bombarding deuterium produced two previously undetected isotopes, helium-3 and hydrogen-3. (wikipedia.org)
  • Gas chromatography (GC) uses a carrier gas, such as hydrogen or helium, to separate compounds based on their interaction with a stationary phase or based on their boiling points. (cannabissciencetech.com)
  • This case report describes the initial care and transport considerations of a pediatric patient who suffered from cerebral gas embolism sustained after inhalation of helium from a pressurized tank. (bvsalud.org)
  • METHODS: Using a ridge filter, a 90-mm wide SOBP for a 210 MeV/u helium-ion beam was created in a broad beam delivery system. (bvsalud.org)
  • For GC carrier gas it has long been assumed that there are only two viable options, helium or hydrogen. (peakscientific.com)
  • Nitrogen , unlike helium, can be produced on-site using a gas generator . (peakscientific.com)
  • This reduces the number of deliveries to the lab, protects laboratory budgets from market-driven helium commodity costs and provides a safer alternative to cylinder gas . (peakscientific.com)
  • Technologies such as 'Gas Saver' and the 'Helium Conservation Module' assist with this. (labmanager.com)
  • When considering alternate carrier gases due to interruptions in helium supply, nitrogen (N 2 ) is not recommended due to limitations in performance, particularly sensitivity. (labmanager.com)
  • Agilent has a very helpful document detailing the steps for conversion: Agilent EI GC/MS Instrument Helium to Hydrogen Carrier Gas Conversion User Guide (part number 5994-2312EN). (labmanager.com)
  • The other channel is equipped with a PoraPlot columns, with helium as the carrier gas. (scioninstruments.com)
Liquid chromatography4
Mixtures4
  • Analytical chromatography is used in quantitative and qualitative analysis of complex mixtures. (cannabissciencetech.com)
  • This course is designed for specialty gas mixture personnel who need the basics of making Specialty Gas mixtures. (weldcoa.com)
  • This course is designed for specialty gas mixture personnel who are already comfortable making gravimetric mixtures and who need advanced training. (weldcoa.com)
  • Longitudinal Relaxation (T 1) of Methane/Hydrogen Mixtures for Operando Characterization of Gas-Phase Reactions. (uni-bremen.de)
Hydrocarbons3
  • A methaniser is used in combination with the FID so that the carbon gases are converted to hydrocarbons, which enables them to be detected a low level ppm. (scioninstruments.com)
  • Measuring hydrocarbons using a flame ionization detector (FID) with the MultiDetek2 gas chromatograph instrument. (ldetek.com)
  • The range of application can go from ASU for monitoring hydrocarbons in bulk gases to environmental applications for measuring VOCs for indoor/outdoor ambient polluated air and industrial stacks. (ldetek.com)
Carbon monoxide1
Compounds6
  • Chromatography allows for the separation of a mixture of compounds by diluting the mixture into a mobile phase which then passes through or over a stationary phase to create separation by the interaction and affinity of individual compounds for one of the phases of the chromatography system ( Figure 1a ). (cannabissciencetech.com)
  • The basic function of chromatography procedures is to separate a mixture of components into their constituent compounds. (cannabissciencetech.com)
  • Preparative chromatography is used to separate compounds for later isolation or purification which then can be used in other processes. (cannabissciencetech.com)
  • It can dissolve most the organic compounds including carbohydrates, polymers, peptides, as well as many inorganic salts and gases. (chemicalbook.com)
  • A rapid and selective method for determining 10 volatile sulfur-containing aroma compounds in wine that have been linked to "offodors" has been developed. (datapdf.com)
  • To study the contribution of volatile sulfur compounds, the GC-SCD method was applied to 68 commercial wines that had reductive sensory evaluations. (datapdf.com)
Argon4
Methane1
  • Energy (fossil fuel) and agriculture required for human activities on Earth produce Greenhouse gases (GHG) such as Carbon Dioxide (CO2), Methane (CH4), Nitrous Oxide (N2O) and Fluorinated gases mainly Sulfur Hexafluoride (SF6). (ldetek.com)
Nitrogen4
Analytical6
  • Since the initial discoveries of the early to mid-20th century the science of chromatography has seen rapid growth and expansion into an important and fundamental tool of many analytical laboratories. (cannabissciencetech.com)
  • The purpose for separation falls into two categories: preparative chromatography or analytical chromatography. (cannabissciencetech.com)
  • Gas chromatography is predominately used for analytical methods, rather than preparatory methods. (cannabissciencetech.com)
  • Functional considerations are how effective these gases are at delivering the purity and velocity required for a lab's analytical application and method. (peakscientific.com)
  • The WIC is a completely functioning cylinder gas filling facility with modern spec gas lab and analytical equipment for quality training and education. (weldcoa.com)
  • This is due to the interaction of the dissolved gases with the stripper column and the length of time it takes for the gases to evaporate and move on to the analytical columns. (scioninstruments.com)
20221
  • We used qualitative methods to examine health department experiences during the initial Omicron surge, from November 2021 to April 2022, assessing successful interventions, barriers, and lessons learned from efforts to promote health equity. (cdc.gov)
Chromatograph4
  • An aliquot of this mixture is introduced into a gas-liquid chromatograph and the ratio of the response of the diazinon to that of the internal standard is determined. (who.int)
  • 1. Gas-liquid chromatograph . (who.int)
  • This course is designed for personnel who need to use a gas chromatograph. (weldcoa.com)
  • This application note will explain how we can effectively do it with a simple gas chromatograph configuration involving the PlasmaDetek detector. (ldetek.com)
Detection2
  • The method utilizes static headspace injection and cool-on-column gas chromatography coupled with sulfur chemiluminescence detection (GC-SCD). (datapdf.com)
  • Validation demonstrated that the method is accurate, precise, robust, and sensitive, with limits of quantitation around 1 μg/L or better, which is below the aroma detection thresholds for the analytes. (datapdf.com)
Processes4
  • Hydrogen isotope biogeochemistry is the scientific study of biological, geological, and chemical processes in the environment using the distribution and relative abundance of hydrogen isotopes. (wikipedia.org)
  • Chromatography processes are further divided into two major categories (liquid or gas chromatography) based on the composition of their mobile phase component. (cannabissciencetech.com)
  • METHODS: The Geant4-DNA Monte Carlo (MC) toolkit allows the simulation of cancer cell geometries that can be combined with accurate modelling of physical, physicochemical and chemical stages of liquid water irradiation, including radiolytic processes. (bvsalud.org)
  • To name just a few, it is used as shield gas in welding and as an inert gas to prevent oxidation in heat treatment processes for metal/titanium production and 3D printing. (ldetek.com)
Headspace1
  • As a result, a portion of gas dissolved in the oil is transferred to the headspace. (scioninstruments.com)
Inert1
  • A product of nuclear fusion and radioactive decay, it is the lightest noble gas, colorless, odorless, and inert with a low boiling point. (acs.org)
Species2
  • The ratio between these two species can be considered the hydrogen isotopic fingerprint of a substance. (wikipedia.org)
  • Ruminants, comprising the majority of ungulate species, must regularly eruct gases from the foregut to relieve excess pressure and maintain a chemical equilibrium. (biologists.com)
Separation1
  • Full separation of all components of interest with easy and reliable quantification results in very good repeatability using the SCION Transformer Gas Oil Analyser. (scioninstruments.com)
Significantly1
  • It is important to note that the component peak shapes are significantly better when the gases are analysed directly using GC than when the stripper method is used. (scioninstruments.com)
Suitable1
  • All three isotopes of hydrogen were found to have magnetic properties suitable for NMR spectroscopy. (wikipedia.org)
Cylinder gas1
  • A gas generator also provides a more consistent gas supply where cylinder gas will give diminishing purity as the cylinder nears the end of its capacity. (peakscientific.com)
Concentration2
  • If the concentration of these gases reach a critical point, the chances of catastrophic transformer failure are high. (scioninstruments.com)
  • A low concentration reference standard gas mixture was used to calibrate the system. (scioninstruments.com)
Considerations1
  • Lab managers need not worry, however, as there are only a few considerations required to make an informed decision on what the most effective carrier gas is for their lab. (peakscientific.com)
Years5
  • The science of chromatography has been around for well over 100 years when plant pigments were first separated by a scientist named Mikhail Tsvet. (cannabissciencetech.com)
  • Agilent has a long history of over 50 years in manufacturing GCs and GC/MSs with extensive experience in design and testing for safety with H 2 gas. (labmanager.com)
  • Our products have been engineered for use with hydrogen for over 40 years, and we are confident of the safety protocols we have in place with our instruments. (labmanager.com)
  • The aim of this work consists in analysing a representative pool of scientific papers (230) and patents (121), from the last 20 years, to have an overview about the evolution of the method and try to understand the efforts spent to improve this technology effectively in academia and in industry. (springer.com)
  • The popularity to measure greenhouse gases (CH4, CO2 and N2O) has increased considerably in the last years with the global warming concerns. (ldetek.com)
Detectors1
  • Chromatography is the well known technique to measure them and different detectors are used to achieve this task. (ldetek.com)
Work2
  • This work on hydrogen isotopes won Urey the 1934 Nobel Prize in Chemistry. (wikipedia.org)
  • METHODS: During 2016-2019, we followed a cohort of healthcare personnel (HCP) targeted for free-of-charge influenza vaccination in five Lima hospitals to quantify risk of influenza, workplace presenteeism (coming to work despite illness), and absenteeism (taking time off from work because of illness). (cdc.gov)
Deliveries1
  • In the past, He shortages have led to higher He gas prices and delayed deliveries, but this is the first time we are seeing a complete lack of delivery due to restricted supply. (labmanager.com)
Chemical2
  • Providing excellent solutions for Environmental, Oil and Gas and Chemical industries, find out more about Scion GC Analysers . (scioninstruments.com)
  • Spatially resoled direct gas-phase thermometry in chemical reactors using NMR. (uni-bremen.de)
Water3
  • The signal observed, called the Pake doublet, was from the magnetically active hydrogens in water. (wikipedia.org)
  • The water content, determined by the method described in WHO/M/7.R1, shall not be higher than 0.6 g/kg. (who.int)
  • This may seem as further muddying of the water when it comes to selecting a carrier gas which will sufficiently allow labs to perform with the accuracy they require and looking after their designated budget. (peakscientific.com)
Column4
  • For those labs that can make this relatively simple method change, there are a number of potential financial benefits that are offset by only the price of a new column. (peakscientific.com)
  • Stripper Column Extraction details the extraction of dissolved gases from a sample of oil by sparging the oil with the carrier gas, onto a stripper column containing a high surface area bead. (scioninstruments.com)
  • The gases are then flushed from the stripper column into a GC for analysis. (scioninstruments.com)
  • Each stripper column extracts the dissolved gases containing in the oil and passes them to two separate channels for analysis. (scioninstruments.com)
Flow rates1
  • The temperatures, gas flow rates, and retention times given below are typical values and may have to be adjusted to obtain optimum results from a given apparatus. (who.int)
System2
Techniques1
  • For SOPs or regulated methods that call for He, He conservation techniques would be an easy alternative for those who do not want to change their GC methods. (labmanager.com)
Safety2
  • Safety is always the first and most important consideration when handling gases. (labmanager.com)
  • For detailed safety information, see the Agilent Hydrogen Safety Manual for GC/MS (part number G7003-90053). (labmanager.com)
Form1
  • Importantly, the method does not form artifacts, such as disulfides, during sample preparation or analysis. (datapdf.com)
Important1
  • The most important are the type of laser and the setting parameters (i.e. pulse frequency, diameter of the nozzle, distance between the nozzle and the material to be treated by the laser, focal position and length, type and pressure of auxiliary gas) that are necessary to determine the types of processed materials. (springer.com)
Make1
  • The equipment and facilities make this a must-have training for anyone desiring to be competitive in the compressed gas industry. (weldcoa.com)
Requirements2
  • The material, sampled from any part of the consignment (see method WHO/M/1.R1), shall comply with the requirements of section 1.2 and with the following requirements. (who.int)
  • Q: If a lab decides to switch from He to H 2 gas, what are the requirements that must be considered? (labmanager.com)
Natural1
  • It is found under the Earth's crust with other natural gases. (acs.org)
Material1
  • In addition, dimethyl sulfoxide can also be directly used as the raw material or carrier of some drug in the pharmaceutical industry. (chemicalbook.com)
Analysis2
  • ASTM D3612 describes in detail three different routes for transformer gas analysis. (scioninstruments.com)
  • The analysis of dissolved gases in transformer oil according to ASTM D3612, method C, can also be performed perfectly with the SCION TOGA analyser with stripper columns. (scioninstruments.com)
Service1
  • If additional assistance is desired, Agilent CrossLab application and method migration consulting service can guide you to overcome application problems and help you optimize your H 2 methods. (labmanager.com)
Sources1
Alternative1
  • Hydrogen (H 2 ) is the best alternative for GC/MS analyses, providing greater chromatographic resolution, speed, and a diverse range of applications while also offering the fewest limitations when compared to N 2 . (labmanager.com)