Mechanism of carboxylic acid photooxidation in atmospheric aqueous phase: formation, fate and reactivity

Autor: Charbouillot, Tiffany, Gorini, Sophie, Voyard, Guillaume, Parazols, Marius, Brigante, Marcello, Deguillaume, Laurent, Delort, A.M., Mailhot, Gilles
Přispěvatelé: Institut de Chimie de Clermont-Ferrand (ICCF), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-SIGMA Clermont (SIGMA Clermont)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de météorologie physique (LaMP), Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Brigante, Marcello
Jazyk: angličtina
Rok vydání: 2012
Předmět:
Zdroj: Atmospheric environment
Atmospheric environment, Elsevier, 2012
Atmospheric environment, 2012
ISSN: 0004-6981
Popis: International audience; In the first part of the work, we investigated the reactivity toward photogenerated hydroxyl radicals (OH) 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 (C5) to complete mineralization into CO2. We report a detailed mechanism on the succinic acid reactivity toward OH 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.
Databáze: OpenAIRE
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