| Main Title |
Transition-Flow Reactor Tube for Measuring Trace Gas Concentrations. |
| Author |
Durham, J. L. ;
Ellestad, T. G. ;
Stockburger, L. ;
Knapp, K. T. ;
Spiller, L. L. ;
|
| CORP Author |
Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab. |
| Year Published |
1986 |
| Report Number |
EPA/600/J-86/308; |
| Stock Number |
PB87-176699 |
| Additional Subjects |
Gases ;
Atmospheric composition ;
Concentration ;
Reactivity ;
Aerosols ;
Air pollution ;
Nitric acid ;
Reprints ;
Dry deposition ;
Transition flow reactor ;
Acid precipitation
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB87-176699 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
7p |
| Abstract |
Dry deposition contributes significantly to the acidification of ecosystems. However, difficulties in measuring dry deposition of reactive gases and fine particles make routine direct monitoring impractical. An alternate approach is to use the 'concentration monitoring' method in which dry deposition is estimated from the product of measured concentration and estimated deposition velocity. A sampling system that performs over the period of 6 hours to 7 days, depending on atmospheric concentrations, has been developed. It consists of a Teflon cyclone to exclude particles larger than about 2 micrometers, selective solid adsorption media for reactive gases - some of which are sampled from a transition flow to avoid bias from particle evaporation, a particle filter, and a final gas adsorption filter to collect the remaining trace gas. Laboratory and field tests have shown that the sampler performs well for HNO3(g). |
| Supplementary Notes |
Pub. in Jnl. of the Air Pollution Control Association, v36 p1228-1232 1986. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Transition-Flow Reactor Tube for Measuring Trace Gas Concentrations. |
| PUB Date Free Form |
1986 |
| Category Codes |
68A; 99A |
| NTIS Prices |
PC A02/MF A01 |
| Primary Description |
600/09 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
718320901 |
| Origin |
NTIS |
| Type |
CAT |
