新农药氯虫酰胺在醇液中的光解  

Photolysis of new insecticide chlorantraniliprole in methanol and ethanol

作　　者：付启明[1,2] 欧晓明[3] 刘红玉[1,2] 裴晖[3] 唐德秀[3] 成四喜[3] 

机构地区：[1]湖南大学环境科学与工程学院,湖南长沙410082 [2]环境生物与控制教育部重点实验室(湖南大学),湖南长沙410082 [3]湖南化工研究院//国家农药创制工程技术研究中心,湖南长沙410007

出　　处：《生态环境学报》2010年第3期532-536,共5页Ecology and Environmental Sciences

基　　金：国家自然科学基金项目(20872033);湖南省自然科学基金项目(09JJ3015)

摘　　要：分别以氙灯和紫外灯为光源,对氯虫酰胺在甲醇和乙醇中的光解动力学及降解机理进行了研究。结果表明,在氙灯和紫外照射下,氯虫酰胺在甲醇和乙醇中的光解符合一级反应动力学规律。在模拟太阳光氙灯辐射下,氯虫酰胺在甲醇和乙醇中的光解半衰期分别为1.58h和2.57h,而紫外光辐射下分别为1.49min和1.60min。采用LC-MS对氯虫酰胺光解产物进行分离和鉴定,推断氯虫酰胺在醇中的光解途径主要涉及到分子环合和重排生成光解产物A[2-(2-溴-4H-吡唑并[1,5-d]吡啶并[3,2-b][1,4]恶嗪-4-基亚氨基)-5-氯-N,3-二甲基苯甲酰胺]和B[2-(3-溴-1-(3-羟基吡啶-2-基)-1H-吡唑-5-基)-6-氯-3,8-二甲基喹啉-4(3H)-酮]。The photolysis kinetics and its mechanisms of new insecticide chlorantraniliprole in methanol and ethanol were investigated under the irradiation of xenon lamp and ultraviolet light .The experimental results showed that photolysis of chlorantraniliprole in methanol and ethanol could be described well by the first order kinetic equation. The half-life of chlorantraniliprole photolysis in methanol and ethanol was 1.58h and 2.57 h, respectively, under the irradiation of xenon lamp light, and 1.49 rain and 1.60 min, respectively, under the irradiation of ultraviolet light. Through the isolation and identification of chlorantraniliprole photodegradation products using LC-MS, the major photodegradation pathways of chlorantraniliprole involved in the molecule C-O or C-N cyclization and rearrangement to give the two major degradation products A [2-（2-bromo-4H-pyrazolo[1,5-d]pyrido[3,2-b][1,4] oxazin-4-ylideneamino）-5-chloro-N,3-dimethylbenzamide] and B [2-（3-bromo-1-（3-hydroxypyridin-2-yl）-lH-pyrazol-5-yl）-6- chloro-3, 8-dimethyl-4（3H）-quinazolinone].

关 键 词：氯虫酰胺 光解动力学 降解机理 甲醇 乙醇 

分 类 号：X592[环境科学与工程—环境工程] S481[农业科学—农药学]