丁烯氟虫腈光降解反应过程及机理  

Kinetics and mechanism of photolysis of new insecticide butylene fipronil

作　　者：王钰[1] 夏婷婷[1] 陈景文[1] 蔡喜运[1] 

机构地区：[1]大连理工大学环境学院,工业生态与环境工程教育部重点实验室,辽宁大连116024

出　　处：《中国环境科学》2012年第1期89-93,共5页China Environmental Science

基　　金：国家自然科学基金资助项目(21077020);中国博士后科学基金资助项目(20090450103);中央高校基本科研业务费专项资金资助(DUT10LK02)

摘　　要：考察了乙腈/水混合溶液中丁烯氟虫腈的光解速率及水体中主要溶解性物质对其光解的影响,通过产物鉴定及模拟计算判定了丁烯氟虫腈光降解反应机理.结果表明,模拟日光下丁烯氟虫腈快速发生光降解,纯水中反应半衰期为17.34 min.腐殖酸通过竞争光吸收来抑制丁烯氟虫腈的光解,NO3-和Cl-对其光解无影响.丁烯氟虫腈光解反应位点位为亚砜基团上的硫原子,主要产物为脱硫化物(MW 442.0),砜化物(MW 506.0)及2种硫化物(MW 473.9和405.8).键级和键长分析也证实丁烯氟虫腈硫原子连接的化学键不稳定,易发生断裂重排反应,生成上述转化产物.Photolysis of butylene fipronil was investigated,including reaction kinetics,transformation product identification and theoretical computation analysis.Photolysis of butylene fipronil under simulated sunlight was well fitted to first-order kinetic model with a half-life of 17.34min.Humic acids significantly reduced photoactivity of the insecticide,due to competitive light absorption,while NO3-and Cl-,didn＇t affect its photolysis.Major transformation products were identified as desulfinyl derivative（MW 442.0）,sulfone derivative（MW 506.0） and sulfide derivatives（MW 473.9 and 405.8）.The proposed pathway of the insecticide was further confirmed by bond order and bond length analysis.The bonds round sulfur atom were easily broken and rearranged to form the transformation products.

关 键 词：丁烯氟虫腈 光降解 溶解性物质 反应机理 

分 类 号：X592[环境科学与工程—环境工程]