7种农药和5种表面活性剂对氯苯嘧啶醇光解的影响

以高压汞灯为光源研究了百菌清、甲氰菊酯、氰戊菊酯、三氟氯氰菊酯、辛硫磷、呋喃丹、乙烯菌核利等7种农药,十二烷基磺酸钠(SDS)、十二烷基苯磺酸钠(SDBS)、聚乙烯(20)山犁糖醇酐硬脂酸酯(Tween-60)、司班-20(Span-20)等5种表面活性剂对氯苯嘧啶醇在玻片表面光解的影响.结果表明,当氯苯嘧啶醇与7种农药以1:1的剂量比涂布于玻片表面时,百菌清、甲氰菊酯、氰戊菊酯、辛硫磷对氯苯嘧啶醇的表面光解有不同程度的猝灭作用,而三氟氯氰菊酯和乙烯菌核利则对氯苯嘧啶醇的光解有一定的光敏化作用.供试的4种表面活性剂对氯苯嘧啶醇的表面光解有一定的影响,十二烷基苯磺酸钠(SDBS)和Tween-60对氯苯嘧啶醇的光解有一定的光敏化作用,而十二烷基磺酸(SDS)对氯苯嘧啶醇的光解表现出一定的光猝灭作用,司班-20对氯苯嘧啶醇的光解作用复杂,低剂量时表现出微弱的光敏化作用,而当剂量比增加到5:1时则表现为一定的光猝灭作用效应.

Effects of 7 pesticides and 5 surfactants on photodegradation of fenarimol

Effects of seven kinds of pesticides and five kinds of surfactants on photodegradation of fungicide fenarimol were studied on glass surface under sunlight and high-pressure merury lamp(HPML).Under HPML,three of the pesticides,namely chlorothalonil,fenpropathrin and fenvalerate effected the photodegradation of fenarimol,and the quenching rate were 22.58%,39.53% and 26.54%,respectively.The pesticide phoxim showed strongly effect,and the quenching rate reached 183.2%,prolonged its half-life up to 35.9min.Vinclozolin sensitized the photolysis of fenarimol,the sensitizing rate reached 38.72%.Two kinds of surfactants,namely Tween-60 and SDBS,were strongly sensitized the photolysis of fenarimol.But surfactant SDS quenched the photolysis of fenarimol.