环境化学
欧晓明,任竞,雷满香,王晓光,樊德方.新农药硫肟醚在有机溶剂中的光解[J].环境科学学报,2005,25(10):1378-1384
新农药硫肟醚在有机溶剂中的光解
- Photolysis of novel insecticide HNPC-A9908 in organic solvents under the irradiation of ultraviolet light
- 基金项目：国家十五科技攻关项目(No.2001BA308A02-10,2004BA308A21-4)
- 作者
- 单位
- 欧晓明
- 湖南化工研究院国家南方农药创制中心湖南基地, 长沙 410007
- 任竞
- 湖南化工研究院国家南方农药创制中心湖南基地, 长沙 410007
- 雷满香
- 湖南化工研究院国家南方农药创制中心湖南基地, 长沙 410007
- 王晓光
- 湖南化工研究院国家南方农药创制中心湖南基地, 长沙 410007
- 樊德方
- 浙江大学农药环境毒理研究所, 杭州 310029
- 摘要：以紫外灯为光源,对硫肟醚在甲醇、丙酮、正己烷和二甲苯等有机溶剂中的光解反应动力学及降解机理进行了初步研究结果表明,硫肟醚在4种有机溶剂中的紫外光解反应符合一级动力学规律,在4种溶剂中反应速率常数分别为1.14×10-1(正己烷)、8.90×10-2(甲醇)、2.46×10-2(二甲苯)和4.51×10-3min-1(丙酮),硫肟醚的降解半衰期分别为6.08,7.79,28.18和153.86 min.通过对硫肟醚光解产物进行分离和LC-MS鉴定,初步推出在紫外光辐射下硫肟醚在有机溶剂中的降解主要涉及到硫肟醚分子的肟醚键(C=N-O-C)断裂、甲硫键(C-S-CH3)光氧化、脱氯反应和光异构化作用等途径.
- Abstract：HNPC-A9908, [O-(3-phenoxybenzyl)-2-methylthio-1-(4-chlorophenyl)propyl ketone oxime], is a novel oxime insecticide which is discovered and developed by Hunan Branch of the National Pesticide Research and Development South Center. The kinetics and mechanism of HNPC-A9908 photolysis in the organic solvents were investigated at the room temperature under the irradiation of ultraviolet light (254 nm). The experimental results showed that photodecomposition of HNPC-A9908 in the organic solvents such as n-hexane, methanol, xylene and acetone under the UV light could be described well by the first-order kinetic equation, and the photodegradation rate decreased with a order of n-hexane>methanol>xylene>acetone. The photodegradation rate constants of HNPC-A9908 in n-hexane, methanol, xylene and acetone were 1.14×10-1 、8.90×10-2 、2.46×10-2 and 4.51×10-3 min-1, and thd correspondling half-lives were 6.05, 7.79, 28.18 and 153.86min, respectively. Through the isolation and identification of photodegradation products using preparative HPLC and LC-MS, it could be concluded that HNPC-A9908 was photolyzed through oxime ether cleavage ( C=N—O—C), oxidation of methylthio group (C—S—CH3), dechlorination and isomerization of the molecule itself.
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