Humic acid in ice: Photo-enhanced conversion of nitrogen dioxide into nitrous acid

Laboratory studies on the heterogeneous conversion of nitrogen dioxide into nitrous acid on irradiated ice films containing humic acid are described. It was found that the presence of light in the visible range of the solar spectrum significantly enhances the rate of nitrous acid release from a humi...

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Bibliographic Details
Published in:Atmospheric environment 2010-12, Vol.44 (40), p.5443-5450
Main Authors: Bartels-Rausch, Thorsten, Brigante, Marcello, Elshorbany, Yasin F., Ammann, Markus, D'Anna, Barbara, George, Christian, Stemmler, Konrad, Ndour, Marieme, Kleffmann, Jörg
Format: Article
Language:English
Subjects:
Atmosphere
Catalysis
Chemical Sciences
Conversion
Cryosphere
Earth, ocean, space
Environment and Society
Environmental Sciences
Exact sciences and technology
External geophysics
Fluxes
Heterogeneous photochemistry
Humic acids
Irradiation
Langmuir-Blodgett films
Meteorology
Nitrogen dioxide
Nitrogen oxides
Nitrous acid
Photolysis
Snow cover
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Summary:Laboratory studies on the heterogeneous conversion of nitrogen dioxide into nitrous acid on irradiated ice films containing humic acid are described. It was found that the presence of light in the visible range of the solar spectrum significantly enhances the rate of nitrous acid release from a humic acid doped ice film. This process might contribute to observed HONO production in snow, where the NO 2 is thought to originate from nitrate photolysis. Analysis of the experimental data based on the Langmuir Hinshelwood model framework allowed quantification of the observed dependencies of the nitrous acid production rate on nitrogen dioxide concentration. The observed dependencies on the humic acid concentration as well as on the irradiation intensity were used to estimate light-driven HONO fluxes for environmental snow covers.
ISSN:1352-2310
0004-6981
1873-2844
DOI:10.1016/j.atmosenv.2009.12.025