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百菌清和毒死蜱在辣椒表面的光化学降解速率
牛大水,花日茂,唐俊,吴祥为,操海群,徐勇
0
(安徽农业大学资源与环境学院,安徽省农产品安全重点实验,安徽合肥,230036)
摘要:
在辣椒表面定量添加毒死蜱和百菌清,研究不同光源、不同初始浓度以及薄膜厚度等因素对辣椒表面农药光化学降解的影响。结果表明,在太阳光和高压汞灯光照下,两种农药的光解均随薄膜厚度的增加而减慢;两种农药的光解速率与其初始浓度呈负相关;两种农药在高压汞灯光照下光解快于在太阳光光照下的光解,百菌清在太阳光下半衰期为1.9 d,在高压汞灯下的半衰期为2.2 h;毒死蜱在太阳光下半衰期为1.8 d,在高压汞灯下的半衰期为1.8 h。
关键词:  光解  百菌清  毒死蜱  辣椒  大棚薄膜
DOI:CNKI: 34-1162/S.20110107.1518.009
投稿时间:2010-03-30
基金项目:国家自然科学基金项目(30972053)和安徽省“十一五”科技攻关项目(08010302166)共同资助。
Photodegradation of chlorothalonil and chlorpyrifos on pepper surface
NIU Da-shui,HUA Ri-mao,TANG Jun,WU Xiang-wei,CAO Hai-qun,XU Yong
(Key Lab of Anhui Agro-food Safety, School of Resources and Environment, Anhui Agricultural University, Hefei 230036)
Abstract:
Effects of initial concentrations, light sources, film thicknesses on photodegradation of chlorothalonil and chlorpyrifos on capsicum surfaces were investigated in this study. The photodegradation rates of both pesticides on capsicum surfaces followed pseudo-first order kinetics. As the film thicknesses increased, the photodegradation rates decreased under high-pressure mercury lamp (HPML) radiation. A negative correlation was found between photolysis rates and initial concentrations of pesticides. The photolysis rates of chlorothalonil and chlorpyrifos under HPML radiation were faster than that under solar radiation. The half-lives of chlorpyrifos and chlorothalonil under high mercury lamp radiation were 1.8 h and 2.2 h, respectively, and the half-lives of chlorpyrifos and chlorothalonil under solar radiation were 1.8 d and 1.9 d, respectively.
Key words:  chlorothalonil  chlorpyrifos  photodegradation  capsicum surface  plastic film

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