研究论文
徐宝才,岳永德,胡颍蕙,花日茂.多菌灵的光化学降解研究[J].环境科学学报,2000,20(5):616-620
多菌灵的光化学降解研究
- Studies on photodegradation of carbendazim in solvents and aqueous solutions
- 基金项目：国家自然科学基金资助项目(29877001)
- 作者
- 单位
- 徐宝才
- 安徽农业大学植保系, 合肥 230036
- 岳永德
- 安徽农业大学植保系, 合肥 230036
- 胡颍蕙
- 安徽农业大学植保系, 合肥 230036
- 花日茂
- 安徽农业大学植保系, 合肥 230036
- 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.
- 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 33.80h.Photosensitizer such as riboflavin, 0.5% acetone and Fe3+, 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 74.62min.The photolytic rates of carbendazim in different water types or pH show following sequence:redistilled water>river water>pond water, or, pH4>pH9>pH7.
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