Headspace Gas Chromatography
ثبت نشده
چکیده
possibility of very selective separations that depend on the geometry of the molecules to be separated rather than the more generalized solubility mechanisms acting in gas}liquid chromatography. It should be theoretically possible to design adsorbents for particular separations. In the branch of liquid chromatography known as afRnity chromatography, for example, it is already possible to manufacture stationary phases of exquisite speciRcity. An analogous approach might be possible in gas}solid chromatography and considerable work is in progress on the preparation and properties of molecular sieves with different dimensions to the well-established materials. See also: II/Chromatography: Gas: Column Technology; Detectors: General (Flame Ionization Detectors and Thermal Conductivity Detectors); Historical Development; Theory of Gas Chromatography. III/Gas Analysis: Gas Chromatography.
منابع مشابه
اندازه گیری سریع ترکیبات آلی فرار در ماست به کمک دستگاه Headspace-Gas Chromatography/Mass Spectrometry
متن کامل
Identification of volatile organic compounds of some Trichoderma species using static headspace gas chromatography-mass spectrometry
Fungi release wide spectrum of volatile organic compounds (VOCs) that belong to several chemical groups with different biochemical origins such as monoterpenes, sesquiterpenes, alcohols, aldehydes, aromatic compounds, esters, furans, ketones, sulfur and nitrogen compounds. Trichoderma species are the most studied fungal biocontrol agents and are successfully used as biofungicides and biofertili...
متن کاملDevelopment of automated headspace gas chromatography determination of dithiocarbamates in plant matrixes.
The determination of dithiocarbamates in plant matrixes is generally carried out by spectrophotometric (European Norm EN 12396-1, 1996) or gas chromatography headspace (European Norm EN 12396-2, 1999) methods. However, the former method presents a risk of carbon disulfide loss during hydrolysis and distillation and its sensitivity is low, whereas the latter method is time-consuming. In comparis...
متن کاملQuantitative endogenous formate analysis in plasma using headspace gas chromatography without a headspace analyzer.
The objective was to develop a simple routine method for quantitative measurement of endogenous formic acid in plasma and whole blood using headspace gas chromatography-flame ionization detection. (GC-FID). Two-hundred microliters of sample was placed in a 1-mL glass vial. Fifty microliters of aqueous ethanol (10%) was added as an internal standard and a derivatizing agent. Ethylformate formati...
متن کاملDetermination of Ethylene Glycol in Used Engine Oil by Headspace-Gas Chromatography
The presence of ethylene glycol in used motor oil is an indication of antifreeze coolant leakage into the crankcase of an internal combustion engine, thus predicting engine-wear problems. Several options for the determination of glycols currently exist, including colorimetric tests which are easy to perform, but subjective in interpretation and not particularly sensitive, fast or cost effective...
متن کاملHeadspace Gas Chromatographic Method for the Determination of Hydrogen Peroxide Residues in Bleaching Effluent
A simple, rapid, accurate, and practical headspace gas chromatographic method is proposed for the determination of hydrogen peroxide residues in bleaching effluent. This method is based on the reaction of hydrogen peroxide with ceric sulfate, under acidic conditions, where hydrogen peroxide is converted to oxygen, which is then measured using headspace gas chromatography (HS-GC) coupled with a ...
متن کامل