Atmospheric degradation of lindane and 1,3-dichloroacetone in the gas phase. Studies at the EUPHORE simulation chamber
Por:
Vera T, Borrás E, Chen J, Coscollá C, Daële V, Mellouki A, Ródenas M, Sidebottom H, Sun X, Yusá V, Zhang X and Muñoz A
Publicada:
1 nov 2015
Ahead of Print:
4 jun 2015
Resumen:
The gas-phase degradation of lindane (gamma-isomer of hexachlorocyclohexane) towards OH radical was investigated under atmospheric conditions at the large outdoor European simulation chamber (EUPHORE) in Valencia, Spain. The rate coefficient for the reaction of hydroxyl radicals with lindane was measured using a conventional relative rate technique leading to a value of k(OH(lindane)) = (6.4 +/- 1.6) x 10(-13) cm(3) molecule(-1) s(-1) at 300 +/- 5 K and atmospheric pressure. The results suggest that the tropospheric lifetime of lindane with respect to OH radicals is approximately 20 days. The product distribution studies on the OH-initiated oxidation of lindane provided evidence that the major initial carbon-containing oxidation product is pentachlorocyclohexanone. 1,3-Dichloroacetone was employed as a model compound for pentachlorocyclohexanone, and an investigation of its photolysis and reaction with OH radicals under atmospheric conditions was carried out. The data indicate that the atmospheric degradation of pentachlorocyclohexanone would be relatively rapid, and would not form persistent organic compounds. Theoretical study was also employed to calculate possible degradation pathways. Mechanism for reaction of lindane with OH radicals is proposed, and C-Cl bond cleavage is discussed. OH abstraction is considered to be a reasonable way for Cl to escape during degradation. The atmospheric implications of the use of lindane as an insecticide are discussed. (C) 2015 Elsevier Ltd. All rights reserved.
Filiaciones:
Vera T:
Fundación CEAM, C/Charles R. Darwin, 14, Parque Tecnológico, 46980 Paterna, Valencia, Spain
Atmospheric Pesticide Research group of Valencia, Valencia, Spain
Borrás E:
Fundación CEAM, C/Charles R. Darwin, 14, Parque Tecnológico, 46980 Paterna, Valencia, Spain
Atmospheric Pesticide Research group of Valencia, Valencia, Spain
Chen J:
Environment Research Institute, Shandong University, Jinan 250100, PR China
:
Atmospheric Pesticide Research group of Valencia, Valencia, Spain
Public Health Laboratory of Valencia-FISABIO, 21, Avenida Catalunya, 46020 Valencia, Spain
Daële V:
CNRS-ICARE/OSUC, 1C Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France
Mellouki A:
Environment Research Institute, Shandong University, Jinan 250100, PR China
CNRS-ICARE/OSUC, 1C Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France
Ródenas M:
Fundación CEAM, C/Charles R. Darwin, 14, Parque Tecnológico, 46980 Paterna, Valencia, Spain
Atmospheric Pesticide Research group of Valencia, Valencia, Spain
Sidebottom H:
School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland
Sun X:
Environment Research Institute, Shandong University, Jinan 250100, PR China
:
Atmospheric Pesticide Research group of Valencia, Valencia, Spain
Public Health Laboratory of Valencia-FISABIO, 21, Avenida Catalunya, 46020 Valencia, Spain
Zhang X:
Environment Research Institute, Shandong University, Jinan 250100, PR China
Muñoz A:
Fundación CEAM, C/Charles R. Darwin, 14, Parque Tecnológico, 46980 Paterna, Valencia, Spain
Atmospheric Pesticide Research group of Valencia, Valencia, Spain
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