双草醚在不同pH溶液及三种水体中的光解  

Photodegradation of Herbicide Bispyribac-sodium at Different pH Values and in Three Different Aqueous Solutions

作　　者：郑丽英[1] 杨仁斌[2] 

机构地区：[1]湖南文理学院化学化工学院,湖南常德415000 [2]湖南农业大学农业环境保护研究所,湖南长沙410128

出　　处：《广州化工》2009年第9期149-151,共3页GuangZhou Chemical Industry

基　　金：湖南文理学院基金资助(JJQD06017)

摘　　要：以高压汞灯为光源,研究了除草剂双草醚在水溶液中的光降解情况。结果表明,在不同pH值缓冲溶液中,双草醚的光解速率为:pH5>pH7>pH9,说明双草醚在偏酸性环境中稳定性较差;在以碳酸氢氨、尿素、磷酸二氢钾这三种最常用的化肥作为添加物的水溶液中,磷酸二氢钾对双草醚的光解表现出较为明显的光敏化作用,碳酸氢氨和尿素对双草醚有微弱的光猝灭作用。The photolysis kinetics and mechanisms of bispyribac -sodium in aqueous solution were studled, unuer the 300W high pressure mercury lamp, photolysis of bispyribac - sodium in phosphate buffer was conducted in buffer solution of different pH value showed that the photolysis rate were quicker in pH5 than that in other buffers and are in the order of pH5 〉 pH7 〉 pH9, indicating the photolytic degradation of bispyribae - sodium in acidity solution, maybe result in poor stability. The experiments on influence of fertilizers on photolysis of bispyribae - sodium under the 300W high - pres- sure mercury lamp showed that KH2PO4 had photosensitizing effects on bispyribae -sodium, and they make photolysis half -life of bispyrihac -sodium decreased. Otherwise, NH4HCO3 and urea both showed photo -quenching effects on photolysis of bispyribac - sodium.

关 键 词：双草醚 光降解 PH 化肥 

分 类 号：TQ454.202[化学工程—农药化工] TQ457.29