Record Display for the EPA National Library Catalog


Main Title Retention time precision in gas chromatographic methods employing cryogenic preconcentration for analysis of whole air samples.
Author Seila, R. L.
Other Authors
Author Title of a Work
Seila, R. L.
CORP Author Environmental Protection Agency, Research Triangle Park, NC. National Exposure Research Lab.
Publisher U.S. Environmental Protection Agency, National Exposure Research Laboratory,
Year Published 1995
Report Number EPA/600/A-95/124
Stock Number PB96-116827
Subjects Gas chromatography
Additional Subjects Air pollution sampling ; Gas chromatography ; Cryogenics ; United States ; Mexico ; Concentration(Composition) ; Hydrocarbons ; Precision ; Quality control ; Retention ; Time ; Field tests ; Cryogenic preconcentration ; Retention time
Library Call Number Additional Info Location Last
NTIS  PB96-116827 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 9 pages ; 28 cm
Over the 1984-1993 period ambient air samples from various U.S. cities and Mexico City were analyzed to determine concentrations of C2- C12 hydrocarbons. Samples were collected by pumping ambient air into Summa stainless steel canisters and analyzed by capillary gas chromatography with cryogenic preconcentration. During this period two methods were employed to improve retention time precision. Data from these field studies were used to determine retention time precision for the peaks identified and to evaluate the two retention time precision enhancement methods. The variation of retention time over the period of analysis is demonstrated by plots of retention time standard deviation versus retention time.
"EPA/600/A-95/124." Microfiche.