Atmos. Chem. Phys., 9, 5093-5105, 2009
www.atmos-chem-phys.net/9/5093/2009/
doi:10.5194/acp-9-5093-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
In-cloud processes of methacrolein under simulated conditions – Part 1: Aqueous phase photooxidation
Yao Liu1, I. El Haddad1, M. Scarfogliero2, L. Nieto-Gligorovski1, B. Temime-Roussel1, E. Quivet1, N. Marchand1, B. Picquet-Varrault2, and A. Monod1
1Universités d'Aix-Marseille I, II et III – CNRS, UMR 6264, Laboratoire Chimie Provence, Equipe: IRA, 3 place Victor Hugo, 13331 Marseilles Cedex 3, France
2Laboratoire Interuniversitaire des Systèmes Atmosphériques (UMR 7583), Université Paris, 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. The measured rate coefficient is consistent with 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: Yao Liu, 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., 9, 5093-5105, doi:10.5194/acp-9-5093-2009, 2009.
 
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