| Main Title |
Automated Cryogenic Preconcentration and Gas Chromatographic Determination of Volatile Organic Compounds in Air. |
| Author |
McClenny, W. A. ;
Pleil, J. D. ;
Holdren, M. W. ;
Smith, R. N. ;
|
| CORP Author |
Environmental Monitoring Systems Lab., Research Triangle Park, NC. ;Northrop Services, Inc., Research Triangle Park, NC. ;Battelle Colubmus Labs., OH. |
| Year Published |
1984 |
| Report Number |
EPA/600/J-84/335; |
| Stock Number |
PB86-101763 |
| Additional Subjects |
Gas analysis ;
Monitors ;
Air pollution ;
Cryogenics ;
Cold traps ;
Gas chromatography ;
Air pollution ;
Trends ;
Concentration(Composition) ;
Performance evaluation ;
Toluene ;
Chloroform ;
Exhaust emissions ;
Automation ;
Design criteria ;
Sampling ;
Reprints ;
Volatile organic compounds ;
Air pollution detection ;
Ethylene/perchloro
|
| Internet Access |
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB86-101763 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
6p |
| Abstract |
The performances of two nominally identical automated monitors for quantifying volatile organic compounds were compared on identical ambient laboratory air samples. The monitors incorporate cryogenic preconcentration subunits specially designed for controlled release of liquid nitrogen to establish a -150 C trap temperature. Measured trends in concentration for perchloroethylene, toluene, and chloroform showed good agreement even at sub-ppbv levels during automated overnight runs, although some effects of adsorption were evident. In a second set of runs, concentration results for one system were plotted versus those for the other. The plots were linear and precise, but slightly biased, probably indicating a change in the system sensitivity between calibration and monitoring. Qualitative comparison using diluted automobile exhaust is also shown. |
| Supplementary Notes |
Prepared in cooperation with Northrop Services, Inc., Research Triangle Park, NC. and Battelle Columbus Labs., OH. |
| Availability Notes |
Pub. in Analytical Chemistry 56, n14 p2947-2951 Dec 84. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Automated Cryogenic Preconcentration and Gas Chromatographic Determination of Volatile Organic Compounds in Air. |
| PUB Date Free Form |
c1984 |
| Category Codes |
14B; 7D; 68A; 99A |
| NTIS Prices |
Not available NTIS |
| Primary Description |
600/08 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
533918010 |
| Origin |
NTIS |
| Type |
CAT |
