期刊
ATMOSPHERIC ENVIRONMENT
卷 56, 期 -, 页码 1-8出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2012.03.079
关键词
Atmosphere; Organic matter; Photochemistry; Phototransformation; Hydroxyl radical; Dimerization
资金
- CNRS-INSU under the National Program (LEFE-CHAT)
- BEAM from the French Ministry of higher Research and Education
- Federation des Recherches en Environnement from the CPER (council of Region Auvergne)
- FEDER
- Observatoire de Physique du Globe de Clermont-Ferrand (OPGC)
In the first part of the work, we investigated the reactivity toward photogenerated hydroxyl radicals ((OH)-O-center dot) of seven monocarboxylic acids and six dicarboxylic acids found in natural cloud water. This leads to the proposition of a schematic degradation pathway linking glutaric acid (C-5) to complete mineralization into CO2. We report a detailed mechanism on the succinic acid reactivity toward (OH)-O-center dot leading to the formation of malonic, glyoxylic and consequently oxalic acids and a comparison with reported pathways proposed by the CAPRAM (Chemical Aqueous Phase RAdical Mechanism) is discussed. We also investigated the photooxidation of formic acid under atmospherically relevant conditions leading to the possible formation of oxalic acid via radical mediated recombination. The second part focuses on the polychromatic irradiation (closed to solar irradiation) of a collected cloud aqueous phase showing that irradiation of cloud water leads to the formation of both formic and acetic acids. Carboxylic acid formation increases in the presence of photogenerated hydroxyl radicals from hydrogen peroxide, showing that photooxidation could play a key role in the formation of carboxylic acids under atmospherically relevant conditions. (C) 2012 Elsevier Ltd. All rights reserved.
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