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Journal of Photochemistry and Photobiology (2011) 32-37
Atmospheric aqueous-phase reactivity: correlation between the hydroxyl radical photoformation and pesticide degradation rate in atmospherically relevant waters
Tiffany Charbouillot 1, Marcello Brigante ( ) 1, Laurent Deguillaume 2, Gilles Mailhot 1

In the present study, we investigated the correlation between the hydroxyl radical formation rate (R OH) and the degradation of a pesticide (mesotrione) in synthetic cloud water solutions and in two real atmospheric cloud waters collected at the top of puy de Doˆ me station (France). Using terephthalic acid as the hydroxyl radical chemical probe, we established the linear correlation between the photogenerated hydroxyl radical under polychromatic wavelengths and the pesticide degradation rate: Rmeso (M s)1) = (1.61 ± 0.15) * 10)1 RÆOH(M s)1). Moreover, the formation rate of hydroxyl radical in two natural cloud waters was estimated considering H2O2 and NO3 ) and the difference between the predicted values and those experimentally obtained could be attributed to the presence of other photochemical sources: ironcomplexes and total organic matter. The organic constituents could play a dual role of sources and scavengers of photoformed hydroxyl radicals in the aqueous phase.
1 :  Institut de Chimie de Clermont-Ferrand (ICCF)
Université Blaise Pascal - Clermont-Ferrand II – CNRS : UMR6296 – Ecole Nationale Supérieure de Chimie de Clermont-Ferrand
2 :  Laboratoire de météorologie physique (LaMP)
CNRS : UMR6016 – INSU – Université Blaise Pascal - Clermont-Ferrand II
Institut de Chimie de Clermont-Ferrand UMR 6296
Chimie/Chimie théorique et/ou physique