氯苯嘧啶醇在水体中的光解机制研究  

Study on the photodegradation mechanism of fenarimol in aqueous solution

作　　者：王丹军[1] 岳永德[2] 汤锋[1] 花日茂[1] 操海群[1] 

机构地区：[1]安徽农业大学环境与资源学院 [2]国际竹藤网络中心,北京100102

出　　处：《环境污染与防治》2008年第7期47-51,共5页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.30370948);延安大学科研基金资助项目(No.YD2004-200)

摘　　要：以太阳光为实验光源研究了氯苯嘧啶醇在水溶液中的光解,考察了pH、水体类型、溶解氧及卤素离子等对其光解的影响。结果表明,氯苯嘧啶醇在水溶液中的光解符合一级动力学方程,在不同水体中氯苯嘧啶醇光解的速率大小顺序为:重蒸水>水库水>湖水>池塘水;氯苯嘧啶醇光解的半衰期随着溶液pH的增大而延长,当pH为5、7、9、11时光解半衰期分别为5.00、6.86、7.45、7.53h;3种卤素离子对氯苯嘧啶醇光解有很大的影响,均表现出强的猝灭作用,3种离子的猝灭能力的大小顺序为I->Br->Cl-;溶解氧和三重态光猝灭剂山梨酸均对氯苯嘧啶醇在水中的光解没有影响,而三重态光敏剂丙酮则对其光解有较强的猝灭作用,表明氯苯嘧啶醇在水中的光解主要以直接光解为主,光解过程不经历三重态。Photodegradation of fenarimol in aqueous solution was studied. The results showed that the photolytic speed in four different types water ranged as： distilled water〉 reservoir water（Dongpu Reservoir）〉lake water （Chaohu）〉pond water（Heichiba）. Photolysis experiment of fenarimol in different buffer solution indicted that it＇s stability decreased in acidic solution. The photolysis half-life of fenarimol was 5.00 h when the pH value of buffer solution was 5, and the photolysis half-life of fenarimol was respectively 6.86 h, 7.45 h and 7.53 h when the pH value was 7, 9 and 11. Three kinds of halogen ions such as I^- , Br^- and Cl^- showed great quenching effect on the photodeg- radation of fenarimol and the effect ranged as： I^-〉Br^-〉Cl-. The dissolved oxygen and triplet state photoquencher sorbic acid had no effect on photodegradaition of fenarimol, and triplet state photosensitizer acetone quenched its pho- tolysis, which indicated the photodegradation of fenarimol may be direct degradation and not through the triplet state.

关 键 词：氯苯嘧啶醇 光解 光敏剂 猝灭作用 

分 类 号：X132[环境科学与工程—环境科学]