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An Improved Method Of Gas Chromatographic Determination Of Trace Organic Vapors In Ambient Air Collected In Canisters, Yong-Jin Shen
An Improved Method Of Gas Chromatographic Determination Of Trace Organic Vapors In Ambient Air Collected In Canisters, Yong-Jin Shen
Theses
An improved method for analysis and quantitation of volatile organic compounds in ambient air has been developed. Samples are collected in evacuated SUMMA polished stainless steel canisters using a sampling flow apparatus with a critical orifice as flowrate controller. Analysis of VOCs in the collected air is carried out by cryogenically concentrating the sample, then thermally transfering it onto the head of a capillary column in a gas chromatograph. The column effluent is measured by a parallel flame ionization detector (FID), and electron capture detector (ECD). The problems associating with quantitative transfer of the sample to the initial cryofocusing loop …