多菌灵在水体系中的光化学降解研究

Study on photochemical degradation of carbendazim in aqueous solution

系统研究了高压汞灯和天然日光照射下多菌灵在天然海水、人工海水和蒸馏水中的光降解情况。天然日光照射下,多菌灵在三种介质中光稳定性均很强,几乎不降解。高压汞灯较天然日光更能有效地激发多菌灵降解。在高压汞灯照射下,多菌灵在蒸馏水中的半寿期为23.42 min。多菌灵在蒸馏水中的光降解速率大于其在人工海水和天然海水的光降解速率,这主要是由于天然海水中存在的阴、阳离子和其它特殊的物质所引起的。同蒸馏水中的光反应相比,人工海水中的离子抑制了多菌灵的光降解反应。实验发现溶液中加入重金属离子会改变多菌灵的光降解速率。

The photochemical degradation of carbendazim(MBC) was systematically studied in seawater,artificial seawater and distilled water under the radiation of high-pressure mercury lamp(HPML) and sunlight.The photochemical degradation of MBC in aqueous solution was very slow under sunlight.The high-pressure mercury lamp was more effective for exciting the photoreaction of MBC relative to sunlight.The half-life of MBC photolysis in distilled water was 23.42 min under HPML.The photolysis of MBC was faster in distill...