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RECORD NUMBER: 360 OF 1867

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
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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.)
Supplementary Notes Pub. in Atmospheric Environment, v19 n2 p325-333 1985. Prepared in cooperation with Unisearch Associates, Inc., Concord (Ontario), and University of South Florida, Tampa. Sponsored by Environmental Sciences Research Lab., Research Triangle Park, NC.
NTIS Title Notes Journal article.
Title Annotations Reprint: Comparison of Three Methods for Measurement of Atmospheric Nitric Acid and Aerosol Nitrate and Ammonium.
PUB Date Free Form c1985
Category Codes 68A; 99A
NTIS Prices PC A03/MF A01
Primary Description 600/09
Document Type NT
Cataloging Source NTIS/MT
Control Number 733831993
Origin NTIS
Type CAT