| Main Title |
Comparison of Three Methods for Measurement of Atmospheric Nitric Acid and Aerosol Nitrate and Ammonium. |
| Author |
Anlauf, K. G. ;
Fellin, P. ;
Wiebe, H. A. ;
Schiff, H. I. ;
Mackay, G. I. ;
|
| CORP Author |
Atmospheric Environment Service, Downsview (Ontario). ;Unisearch Associates, Inc., Concord (Ontario). ;University of South Florida, Tampa.;Environmental Sciences Research Lab., Research Triangle Park, NC. |
| Year Published |
1985 |
| Report Number |
EPA/600/J-85/495; |
| Stock Number |
PB88-104237 |
| Additional Subjects |
Atmospherics ;
Measurement ;
Aerosols ;
Nitric acid ;
Ammonium compounds ;
Air pollution ;
Particles ;
Photochemical reactions ;
Reprints ;
Air pollution sampling ;
Nitrates ;
Acid rain
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB88-104237 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
11p |
| Abstract |
Three methods for measuring gaseous ambient nitric acid in the low concentration range 0-15 mcg/cum were compared under field conditions in southwestern Ontario during June 1-14, 1982. The methods employed were (1) tunable diode laser absorption, (2) a tungstic acid denuder tube, and (3) a filter pack containing a Teflon-nylon-W41 filter combination operated over 3-hour sampling periods. In general, the three methods measured nitric acid with adequate sensitivity (sub ppb) and they correlated reasonably over the low ambient concentrations considered here. However, there were some notable differences (up to a factor of 2 at night) by the tungstic acid and filter pack methods. These correlated well but again some differences were observed. During the field comparison, particulate nitrate and ammonium were also measured (0-6 mcg/cu m range) by the tungstic acid and filter pack methods. These correlated well but again some differences were observed. (Copyright (c) 1985 Pergamon Press Ltd.) |
