Atmos. Chem. Phys. Discuss., 9, 6397-6424, 2009
© Author(s) 2009. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
In-cloud processes of methacrolein under simulated conditions – Part 1: Aqueous phase photooxidation
Y. Liu1, I. El Haddad1, M. Scarfogliero2, L. Nieto-Gligorovski1, B. Temime-Roussel1, E. Quivet1, N. Marchand1, B. Picquet-Varrault2, and A. Monod1
1Laboratoire Chimie Provence (UMR 6264), Universités d'Aix-Marseille I, II et III – CNRS, 3 place Victor Hugo, 13331 Marseilles Cedex 3, France
2Laboratoire Interuniversitaire des Systèmes Atmosphériques (UMR 7583), Université Paris 12-CNRS, 61 avenue du Général de Gaulle, 94010 Créteil, France

Abstract. The photooxidation of methacrolein was studied in the aqueous phase under simulated cloud droplet conditions. The obtained rate constant of OH-oxidation of methacrolein at 6°C in unbuffered solutions was 5.8 (±0.9)×109 M−1 s−1. This kinetic study showed that the oxidation proceeds mainly by OH-addition on the C=C bond. This was confirmed by the mechanism established on the study of the reaction products (at 25°C in unbuffered solutions) where methylglyoxal, formaldehyde, hydroxyacetone and acetic acid/acetate were the main reaction products. An upper limit for the total carbon yield was estimated to range from 53 to 85%, indicating that some reaction products remain unidentified. A possible source of this mismatch is the formation of higher molecular weight compounds as primary reaction products which are presented in El Haddad et al. (2009) and Michaud et al. (2009).

Citation: Liu, Y., El Haddad, I., Scarfogliero, M., Nieto-Gligorovski, L., Temime-Roussel, B., Quivet, E., Marchand, N., Picquet-Varrault, B., and Monod, A.: In-cloud processes of methacrolein under simulated conditions – Part 1: Aqueous phase photooxidation, Atmos. Chem. Phys. Discuss., 9, 6397-6424, doi:10.5194/acpd-9-6397-2009, 2009.
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