Studies on atmospheric degradation of diazinon in the EUPHORE simulation chamber |
| |
Authors: | Muñoz Amalia Person Annaïg Le Calvé Stéphane Le Mellouki Abdelwahid Borrás Esther Daële Véronique Vera Teresa |
| |
Institution: | a Instituto Universitario CEAM-UMH, C/Charles R. Darwin 14, Parque Tecnológico, 46980 Paterna, Valencia, Spain b CNRS-ICARE, 1C Avenue de la Recherche Scientifique, 45071 Orléans, Cedex 2, France c Laboratoire des Matériaux, Surfaces et Procédés pour la Catalyse (LMSPC, UMR 7515 CNRS/UdS), 25 rue Becquerel, 67087 Strasbourg, Cedex 02, France |
| |
Abstract: | The gas phase atmospheric degradation of diazinon has been investigated at the large outdoor European Photoreactor (EUPHORE) in Valencia, Spain. The rate constant for reaction of diazinon with OH radicals was measured using a conventional relative rate method with di-n-buthylether as reference compound being k = (3.5 ± 1.2) × 10−11 cm3 molecule−1 s−1 at 302 ± 10 K and atmospheric pressure. The available evidence indicates that tropospheric degradation of diazinon is mainly controlled by reaction with OH radicals, and that the tropospheric lifetime with respect to the OH reaction is estimated to be around 4 h whereas its lifetime with respect to the photolysis is higher than 1 d under our conditions. Significant aerosol formation was observed following the reaction of diazinon with OH radicals, and the main carbon-containing products detected in the particle phase were hydroxydiazinon, hydroxydiazoxon and 2-isopropyl-6-methyl-pyrimidinyl-4-ol. |
| |
Keywords: | Air Kinetics Diazinon Photooxidation Atmospheric fate Aerosols |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|