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虱螨脲在土壤中的降解、吸附和移动特性

Keywords: 虱螨脲,土壤降解,吸附性,移动性

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Abstract:

采用室内模拟试验方法,研究了虱螨脲在3种土壤中的降解、吸附和移动特性。结果表明:25℃下,虱螨脲在江西红壤中的降解半衰期为101d,属于中等降解农药;在太湖水稻土和东北黑土中的降解半衰期分别为74.5d和55.5d,属于较易降解农药。土壤有机质含量是影响虱螨脲降解速率的主要因素;3种土壤对虱螨脲具有较强的吸附性,且土壤有机质含量越高,对虱螨脲的吸附性越强;3种土壤对虱螨脲的吸附自由能变化均小于40kJ·mol-1,属于物理吸附;虱螨脲在土壤中不易移动,正常条件下不会造成地下水的污染。

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