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• 基金项目：

• 陈朝晖
• 中国科学院环境化学研究所

• 戴广茂
• 中国科学院环境化学研究所

• 摘要：以高压汞灯为光源,研究了六六六(BHC)在水溶液中的光解。在水溶液中,除α-BHC外,BHC的光化学降解与光异构化是同时发生的。光异构化规律是:分子中一个氯原子改变其原来构象而朝着形成对光更加稳定的异构体转化。经色质谱联用鉴定,证明氯苯、二氯苯、四氯环己烯、一氯酚、二氯酚、三氯酚及三氯环己烯醇为BHC在水溶液中的光解产物。提出了包含还原脱氯和羟基取代的这一光解反应的历程。

• Abstract：Photolysis of BHC in aqueous solution was investigated. A high pressure Hg lamp was used as the eight source. It was found that with the exception of a-form the photochemical degradation and photo-isomerization of the BHC isomers studied take place simultaneously, and that in isomerization process the conformation of one of the Cl atcms in BHC tends to change with the result of formation of a more light-stable isomer. By use of GC/MS method, the following compounds were identified as the photodegradation products of BHC in aqueous solution: chlorobenzene, dichlorobenzene, tetrachlorocyclohexene, chlorophenol, dichlorophenol, trichlorophenol and trichlorocyclohexenol. A photo degradation mechanism involving reductive dechlorination and hydroxy substitution was proposed.

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