中文摘要：

以高压汞灯为光源,研究了不同种类、不同浓度的表面活性剂对水中百菌清光解的影响。结果表明,十二烷基磺酸钠（SDS）、十二烷基苯磺酸钠（SDBS）、Tween60和Span20对百菌清的光解均有光敏化作用,光敏率分别为18.78%、2.85%、58.55%和57.97%,十六烷基三甲基溴化铵（CTAB）对百菌清光解有强烈的光猝灭作用,光猝灭率达57.59%;表面活性剂浓度对百菌清的光解影响较大,在一定的浓度范围内,随着十二烷基磺酸钠和Tween60浓度的增大,百菌清的光解速率逐渐增大,当表面活性剂浓度增大到一定程度时,百菌清的光解速率减慢,甚至产生光猝灭效应;不同表面活性剂混合后对百菌清光解的影响比表面活性剂单独存在时差异较大。

英文摘要：

Chlorothalonil, a halogenated benzonitrile compound, is one of the most widely used fungicides in the world. Photodegradation of chlorothalonil was investigated in different surfactants solution under high pressure mercury lamp （HPML）. Sodium laurylsulfonate （SDS）, sodium dodecylbenzene sulfonate （SDBS）, Tween60 and Span20 enhanced the photodegradation of chlorothalonil, with photosensitizing efficiency of 18.78%, 2.85%, 58.55% and 57.97%, respectively. But cetyltrimethyl ammonium bromide （CTAB） showed intensive photoquench effect on the photolysis of chlorothalonil, with photoquench efficiency of 57.59%. The effect of surfactants concentrations on the photolysis rate constant of chlorothalonil was also studied. The photolysis of chlorothalonil was affected by the concentrations of SDS and Tween60. The photolysis half-lives of chlorothalonil in solution containing different concentrations of SDS （0, 1, 5, 25, 50 mg·L^-1） were 29.12, 24.84, 23.65, 22.87 and 32.54 min, respectively, while, in solution containing different concentrations of Tween60, they were 29.12, 29.00, 12.07, 18.09 and 32.08 min, respectively. The effect of single surfactant on photolysis of chlorothalonil was different from that of mixed surfactants.