EUPHORE, Instituto Universitario UMH-CEAM, C/Charles R. Darwin, 14, Parque Tecnológico, 46980 Paterna, Valencia, Spain.
EUPHORE, Instituto Universitario UMH-CEAM, C/Charles R. Darwin, 14, Parque Tecnológico, 46980 Paterna, Valencia, Spain.
Chemosphere. 2014 Sep;111:522-8. doi: 10.1016/j.chemosphere.2014.04.087. Epub 2014 May 22.
The OH initiated oxidation of chlorpyrifos (a widely used insecticide) and its photooxidation product chlorpyrifos-oxon were investigated at the large outdoor European Photoreactor (EUPHORE). The rate constants for reaction of chlorpyrifos and chlorpyrifos oxon with OH radicals were measured using a conventional relative rate method. The value of the OH reaction rate constants with chlorpyrifos and chlorpyrifos-oxon were determined to be k=(9.1±2.1)×10(-11)cm(3)molecule(-1)s(-1) and (1.7±0.9)×10(-11)cm(3)molecule(-1)s(-1) at 303±5K and atmospheric pressure. They gave an atmospheric lifetime in relation to the reaction with OH of approximately 2h and 11h for chlorpyrifos and chlorpyrifos-oxon, respectively. Photolysis was found to be unimportant relative to reaction with OH. The main products detected in the gas phase from the reaction of OH with chlorpyrifos were SO2, chlorpyrifos-oxon, 3,5,6-trichloro-2-pyridinol and diethylphosphate with molar yields of 17±5%, ∼10%, 8±4% and 30±9%, respectively.
OH 引发了毒死蜱（一种广泛使用的杀虫剂）及其光氧化产物毒死蜱-氧（chlorpyrifos-oxon）的氧化反应，该反应在大型户外欧洲光反应器（EUPHORE）中进行了研究。使用传统的相对速率法测量了氯吡硫磷和氯吡硫磷氧与 OH 自由基的反应速率常数。在 303±5K 和常压下，OH 与氯吡硫磷和氯吡硫磷氧的反应速率常数分别确定为 k=(9.1±2.1)×10(-11)cm(3)molecule(-1)s(-1)和 (1.7±0.9)×10(-11)cm(3)molecule(-1)s(-1)。这分别导致与 OH 反应的大气寿命约为 2h 和 11h。与 OH 反应相对于光解而言不太重要。在气相中从 OH 与氯吡硫磷的反应中检测到的主要产物为 SO2、氯吡硫磷氧、3,5,6-三氯-2-吡啶醇和二乙基磷酸，摩尔产率分别为 17±5%、约 10%、8±4%和 30±9%。
Zotero 插件