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哒螨灵农药在土壤中的降解吸附和移动特性

Keywords: 哒螨灵,土壤降解,吸附,移动,农药

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Abstract:

采用室内模拟试验方法,研究了哒螨灵在3种土壤中的降解、吸附和移动特性。结果表明,25℃下,哒螨灵在江西红壤、河南二合土和东北黑土中的降解半衰期分别为41.0、55.9和72.2d,属于易降解农药,其降解速率依次为江西红壤>河南二合土>东北黑土。酸性条件有利于哒螨灵的降解,土壤pH值对哒螨灵降解的影响比土壤有机质含量大。3种土壤对哒螨灵农药的吸附均较好地符合Freundich方程,吸附系数Kd值分别为3.35×103、6.17×103和8.48×103,具有极强的吸附性,且土壤有机质含量越高,对哒螨灵的吸附性越强。土壤对哒螨灵的吸附自由能变化均小于40kJ·mol-1,属于物理吸附。哒螨灵在土壤中不易移动,3种土壤薄层移动试验的Rf值均仅为0.05,正常条件下不会造成对地下水的污染。

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