Instituto Universitario CEAM-UMH, C/Charles R. Darwin 14, Parque Tecnológico, 46980 Paterna, Valencia, Spain.
Chemosphere. 2011 Oct;85(5):724-30. doi: 10.1016/j.chemosphere.2011.06.044. Epub 2011 Jul 5.
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 4h whereas its lifetime with respect to the photolysis is higher than 1d 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.
在西班牙巴伦西亚的大型户外欧洲光反应器（EUPHORE）中研究了二嗪磷的气相大气降解。使用传统的相对速率法，以二正丁醚作为参考化合物，在 302±10 K 和大气压力下，测量了二嗪磷与 OH 自由基的反应速率常数 k = (3.5±1.2)×10⁻¹¹ cm³分子⁻¹ s⁻¹。现有证据表明，二嗪磷在对流层中的降解主要受与 OH 自由基的反应控制，并且根据 OH 反应，其对流层寿命估计约为 4h，而在我们的条件下，其光解寿命高于 1d。在二嗪磷与 OH 自由基反应后观察到明显的气溶胶形成，在颗粒相中检测到的主要含碳产物为羟二嗪磷、羟二嗪氧和 2-异丙基-6-甲基嘧啶-4-醇。
