阴离子对氯苯嘧啶醇光化学降解的影响  

Effect of Anion on the Photodegradation of Fenarimol

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：《农业环境科学学报》2008年第5期2023-2027,共5页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(30370948);延安大学科研基金项目(YD2004-200)

摘　　要：为了探讨几种阴离子对杀菌剂氯苯嘧啶醇(FEN)在水体中的光化学降解的影响,以自然光为光源考察了水体类型、卤素离子、硝酸根离子和亚硝酸根离子对其光化学降解的影响,并对其光解机理进行了讨论。结果表明,氯苯嘧啶醇在水体中的光化学降解符合一级动力学方程,其在不同水体中的光解速率顺序为:蒸馏水>巢湖水>池塘水(黑池坝水)>董埔水库水;3种卤素离子对氯苯嘧啶醇光解有极强的影响,均表现出光猝灭作用,3种离子的猝灭能力由大到小的顺序为I->Br->Cl-;硝酸盐、亚硝酸盐也对氯苯嘧啶醇的光解表现出猝灭作用,且随着盐浓度的增大作用增强;三线态光猝灭剂山梨酸对氯苯嘧啶醇水中光解没有影响,而三线态光敏剂丙酮对其太阳光下的光解表现出较强的猝灭作用,表明氯苯嘧啶醇在水中的光解以直接光解为主,光解过程不经历三线态。To investigate the effect of different kinds of anion on the photodegradation of Fenarimol in aqueous solution, sunlight was employed as experimental light resource and the effect of water types, halogen anion, nitrate ion and nitrite ion on the photodegradation of, Fenarimol was studied. The results showed that the physical and chemical properties of water such as pH value, conductance and the content of solute in water had obvious effect on the photodegradation of Fenarimol because these factors influenced the absorbency of Fenarimol in water. And the photolytic rate of Fenarimol in four different types of water ranged as：distilled water〉lake water（ChaoHu）〉pond water（Heichiba）〉 river water（Dongpushuiku）. Three kinds of halogen ions such as Ⅰ^-, Br^- and Cl^- showed great quenching effect on the photodegradation of Fenarimol and the effect ranged as ： Ⅰ^-〉Br^-〉Cl^-. The nitrate ion and nitrite ion also showed great quenching effect on its photolysis and the effect became stronger with the dosage increase. The results demonstrated that these anions competed with Fenarimol for light and so quenched the photolysis of Fenarimol. The triplet state photoquencher sorbic acid had no effect on photodecomposition of Fenarimol and the triplet state photosensitizer acetone quenched its photolysis, which indicated the photodecomposition of Fenarimol may be direct degradation and not through the triplet state.

关 键 词：氯苯嘧啶醇 光化学降解 光猝灭 三线态光敏剂 三线态光猝灭剂 

分 类 号：X592[环境科学与工程—环境工程]