| Main Title |
Retention time precision in gas chromatographic methods employing cryogenic preconcentration for analysis of whole air samples. |
| Author |
Seila, R. L.
|
| Other Authors |
|
| 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
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB96-116827 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
9 pages ; 28 cm |
| Abstract |
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. |
| Notes |
"EPA/600/A-95/124." Microfiche. |
