Ebook Static Headspace Gas Chromatography: Theory And PracticeStatic headspace gas chromatography is a technique used for the concentration and analysis of volatile organic compounds. Useful in the analyses of alcohols in blood and residual solvents in pharmaceutical products, as well as the industrial analyses of monomers in polymers and plastics, flavor compounds in beverages and food products, and fragrances in perfumes and cosmetics, it enables the analyst to assay a variety of sample matrices, while avoiding the time-consuming and costly preparation involved with traditional GC. This book provides the most thorough and current treatment of static HS-GC. Preis inkl. MwSt, zzgl.
Headspace Analysis of Household Paint
Headspace gas chromatography for dissolved gas measurement
Headspace gas chromatography uses headspace gas—from the top or "head" of a sealed container containing a liquid or solid brought to equilibrium  —injected directly onto a gas chromatographic column for separation and analysis. In this process, only the most volatile most readily existing as a vapor substances make it to the column. The technique is commonly applied to the analysis of polymers , food and beverages, blood alcohol levels , environmental variables , cosmetics , and pharmaceutical ingredients. There are three states of matter under these conditions: solids, liquids, and gases. Although all three are distinct states, both solids and gases can dissolve or disperse in liquids. The most commonly occurring liquid in the biosphere is water. All components of the atmosphere are capable of dissolving in water to some degree.
GC Theory and Practice of Static Headspace Gas Chromatography. A Technical Guide for Static Headspace Analysis Using GC PDF Read Static.
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Formaldehyde is a highly reactive impurity that can be found in many pharmaceutical excipients. Trace levels of this impurity may affect drug product stability, safety, efficacy, and performance. A static headspace gas chromatographic method was developed and validated to determine formaldehyde in pharmaceutical excipients after an effective derivatization procedure using acidified ethanol. Despite the simplicity of the developed method, however, it is characterized by its specificity, accuracy, and precision. The limits of detection and quantification of formaldehyde in the samples were of 2. This method is characterized by using simple and economic GC-FID technique instead of MS detection, and it is successfully used to analyze formaldehyde in commonly used pharmaceutical excipients.
In principle it is dynamic gas extraction, carried out stepwise and establishing equilibrium conditions in each step. The concentration of the analyte in the headspace decreases exponentially during the series of extraction steps: by proper mathematical extrapolation the total peak area proportional to the total amount of analyte present in the original sample can be obtained. This paper investigates MHE from the theoretical point of view using two approaches: a simplified theory regarding MHE as a first-order reaction, and a rigorous, step-by-step treatment of the MHE procedure. Special consideration is given to the fact that the headspace gas is only partially removed between individual steps. As shown, the results of both treatments are essentially the same hence the method is theoretically sound.