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OLS Field Name OLS Field Data
Main Title Intercomparison of Atmospheric Nitric Acid Measurements at Elevated Ambient Concentrations.
Author Anlauf, K. G. ; Wiebe, H. A. ; Tuazon, E. C. ; Winer, A. M. ; Mackay, G. I. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. ;Atmospheric Environment Service, Downsview (Ontario). ;California Univ., Riverside. Statewide Air Pollution Research Center. ;Unisearch Associates, Inc., Concord (Ontario).
Publisher c1991
Year Published 1991
Report Number EPA/600/J-91/074;
Stock Number PB91-196543
Additional Subjects Nitric acid ; Air pollution monitoring ; Spectroscopic analysis ; Air sampling ; Atmospheric chemistry ; Comparison ; Air filters ; Performance evaluation ; Reprints ; Glendora(California)
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NTIS  PB91-196543 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 09/04/1991
Collation 9p
Abstract Several methods for measurement of ambient HNO3 were compared over a 9-day period during the Carbonaceous Species Methods Comparison Study at Glendora, CA, in August 1986. Hourly averaged HNO3 concentrations were in the range 0.5-25 ppbv, with hourly maxima each day in excess of 15 ppbv. The measurement methods included absorption by a nylon filter in an open-face filter pack (FP), a transition flow reactor tube (TRF) in conjunction with a nylon filter, tunable diode laser absorption spectroscopy (TDLAS) and Fourier transform infrared (FT-IR) spectroscopy. The latter method was chosen as the common method for comparison of the daytime HNO3 measurements (nighttime concentrations were below the 4 ppbv detection limit of the FT-IR). Comparing the mean daytime HNO3 mixing ratios, the 1-h FP method yielded 13.9 ppbv (vs 12.9 for FT-IR), the 1-h TDLAS was 11.7 ppbv (vs 13.2 for FT-IR) and the 12-h TFR was 11.4 ppbv (vs 12.0 for FT-IR). For the nighttime periods, the means of the 2-h FP and the 12-h TER were 1.2 and 0.95 ppbv, respectively. The measured means were within the uncertainties of the methods.
Supplementary Notes Pub. in Atmospheric Environment, v25A n2 p393-399 1991. Prepared in cooperation with Atmospheric Environment Service, Downsview (Ontario), California Univ., Riverside. Statewide Air Pollution Research Center, and Unisearch Associates, Inc., Concord (Ontario).
NTIS Title Notes Journal article.
Title Annotations Reprint: Intercomparison of Atmospheric Nitric Acid Measurements at Elevated Ambient Concentrations.
Category Codes 68A
NTIS Prices PC A02/MF A01
Primary Description 600/09
Document Type NT
Cataloging Source NTIS/MT
Control Number 120724975
Origin NTIS
Type CAT