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RECORD NUMBER: 2 OF 3

OLS Field Name OLS Field Data
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
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Status
NTIS  PB88-104237 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
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.)