噁唑酰草胺的光解动力学研究

Photolysis Kinetics and Mechanism of Metamifop

研究噁唑酰草胺的环境特性,可以为正确评价噁唑酰草胺的环境行为,更好地指导噁唑酰草胺的合理使用及环境评价提供科学依据。以高压汞灯和氙灯为光源,分析噁唑酰草胺在有机溶剂、水溶液中的光化学降解。结果表明,不同光源条件下,噁唑酰草胺的光解半衰期为2.1 h（汞灯）和9.3 h（氙灯）,噁唑酰草胺在有机溶剂中半衰期为2.5~25.3 h,光解速率次序为：甲醇〉乙醇〉正己烷〉丙酮。噁唑酰草胺水中的初始浓度越大,光解速率越小。噁唑酰草胺的光解与初始浓度大小、有机溶剂种类和辐射波长长短有关。

In order to study the environmental characteristics of metamifop for correctly appraising metamifop in the environment for the photodissociation behavior,as well as providing scientific basis for guiding metamifop scientifically and reasonably use.Photolysis of metamifop was determined in organic solvents and aqueous solution under the high pressure mercury lamp and xenon lamp.The results showed that：under the irradiation of mercury lamp and xenon lamp,the photolysis half lives were 2.1 h and 9.3 h.Photolysis of metamifop half-life in organic solvents were 2.5-25.3 h.The photolysis rate of metamifop in different of organic solvents showed following sequences：methanolethanoln-hexaneactone.Metamifop photolysis rates were decreased with the initial concentration increasing.Initial concentration,the type of organic solvent,length of the radiation wave length were related to the photolysis rate of metamifop.