Citation:

Anlauf, K. AND e. al. INTERCOMPARISON OF ATMOSPHERIC NITRIC ACID MEASUREMENTS AT ELEVATED AMBIENT CONCENTRATIONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-91/074 (NTIS PB91196543).

Description:

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. ourly averaged HNO3 concentrations were in the range 0.5-25 ppbv, with hourly maxima each day in excess of 15 ppbv. he 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. he 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). omparing the mean daytime HNO3 mixing ratios, the 1-h FP method yielded 13.9 ppbv (vs. 12.0 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). or the nighttime periods, the means of the 2-h FP and the 12-h TFR were 1.2 and 0.95 ppbv, respectively. hese measured means were within the uncertainties of the methods.

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