Intercomparison of atmospheric nitric acid measurements at elevated ambient concentrations
| Autor: | Ernesto C. Tuazon, H. A. Wiebe, H.I. Schiff, G.I. Mackay, T.G. Ellestad, Kurt G. Anlauf, Arthur M. Winer, Kenneth T. Knapp |
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| Rok vydání: | 1991 |
| Předmět: |
Detection limit
Daytime chemistry.chemical_compound Tunable diode laser absorption spectroscopy Absorption spectroscopy chemistry Nitric acid Analytical chemistry General Earth and Planetary Sciences Infrared spectroscopy Spectroscopy Absorption (electromagnetic radiation) General Environmental Science |
| Zdroj: | Atmospheric Environment. Part A. General Topics. 25:393-399 |
| ISSN: | 0960-1686 |
| DOI: | 10.1016/0960-1686(91)90310-4 |
| Popis: | Several methods for measurement of ambient HNO3 were compared over a 9-day period during the Carbonaceous Species Methods Comparison Study at Glendora, California, 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 (TFR) 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 (night-time 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 night-time periods, the means of the 2-h FP and the 12-h TFR were 1.2 and 0.95 ppbv, respectively. These measured means were within the uncertainities of the methods. |
| Databáze: | OpenAIRE |
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