【摘要】 以太阳光和高压汞灯为光源研究了多菌灵在溶液相中的光化学降解 .在太阳光下 ,多菌灵在甲醇、正己烷、重蒸水、3种pH缓冲液和不同类型水质中光稳定性很强 ,但在丙酮中可以光解 ,光解半衰期为 33 80h .光敏剂核黄素、0 5%丙酮、Fe3+能加快多菌灵在水溶液中的光解速率 ,其中核黄素敏化效果最显著 .说明在太阳光下多菌灵在水溶液中主要是间接光解 .与太阳光源比较 ,多菌灵在高压汞灯下主要进行直接光解 .在重蒸水中的光解半衰期为 74 62min ;水中的溶解物质对多菌灵的光解有一定的抑制 ;在不同 pH溶液中的光解速率为 pH4>pH9>pH7;三唑酮、克百威和丁草胺分别与多菌灵混合照光时 ,对其有强烈的光猝灭作用 .更多还原

【Abstract】 Under sunlight or high pressure mercury lamp(HPML),the phototransformation of carbendazim in solvents and aqueous solutions was studied.The main results were summarized as follows:Carbendazim decomposed very slowly in aqueous phase, n \|hexane and methanol under sunlight.The photolytic rate of MBC in acetone was high with half\|life of 33.80?h.Photosensitizer such as riboflavin,0 5% acetone and Fe +3 ,can enhance photolysis of MBC in aqueous solutions.Among them,riboflavin is the most senstivive one MBC can be degraded by 53 47% after 16 hours.Three pesticides,namely,triadimefon,butachlor,and carbofuran can affected significantly the photodecomposition of MBC in water under HPML.By 2 hours irradiation,the photoquench efficiency of triadimefon,butachlor and carbofuran on cabendazim are 244 05%,252 81%,and 262 92%,respectively.Under HPML,direct photolysis is the main process.The half\|life in redistilled water is 74 62?min.The photolytic rates of carbendazim in different water types or pH show following sequence:redistilled water>river water>pond water,or,pH4>pH9>pH7.更多还原