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

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Title: Humic acid in ice: Photo-enhanced conversion of nitrogen dioxide into nitrous acid
Authors: Bartels-Rausch, Thorsten1 thorsten.bartels-rausch@psi.ch, Brigante, Marcello2,3, Elshorbany, Yasin F.4, Ammann, Markus1, D'Anna, Barbara2,3, George, Christian2,3, Stemmler, Konrad1, Ndour, Marieme2,3, Kleffmann, Jörg4
Source: Atmospheric Environment. Dec2010, Vol. 44 Issue 40, p5443-5450. 8p.
Subjects: Humic acid, Cryosphere, Atmospheric chemistry, Nitrogen dioxide, Nitrous acid, Photochemistry, Experiments, Snow cover, Nitrogen oxides, Nitrogen oxides & the environment
Abstract: Abstract: 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 NO2 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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Abstract: 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 NO2 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. [ABSTRACT FROM AUTHOR]
ISSN:13522310
DOI:10.1016/j.atmosenv.2009.12.025