Record Display for the EPA National Library Catalog


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)
Library Call Number Additional Info Location Last
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
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.