虱螨脲在土壤中的降解、吸附和移动特性--《农业环境科学学报》2011年06期

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虱螨脲在土壤中的降解、吸附和移动特性

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(R@(r|L%R6I(ZZ0【摘要】: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。水利论文1@T7]lJK ].aZ P

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虱螨脲 土壤降解 吸附性 移动性

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虱螨脲(Lufenuron),化学成分为(RS)-1-[2,5-二氯-4-(1,1,2,3,3,3-六氟丙氧基)苯基]-3-(2,6-二氟苯甲酰基)脲,是苯甲酰脲类杀虫剂,熔点168.7~169.4℃,蒸气压(25℃)小于4×10-3mPa,水中溶解度小于0.06mg·L-(125℃),能较好地溶解于大多数有机溶剂,斜-辛醇/水分配系数(25℃)lg P=

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