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[目的]为评价丁醚脲在棉花上使用后的环境安全性,在商丘和杭州2地进行了其在棉花上的残留动态和最终残留试验。[方法]样品用乙腈提取,乙酸铵和NaCl液液分配,PSA结合GCB净化,后经LC-MS/MS测定其残留量。[结果]丁醚脲在棉叶上的半衰期为0.8~1.1 d;在土壤中的半衰期为1.4~1.9 d;最后1次施药后间隔7、14、21 d棉籽中丁醚脲的残留量均≤0.005 mg/kg。[结论]建议13%联苯·丁醚脲乳油防治棉花红蜘蛛,在推荐剂量下最多施药1次,安全间隔期为7 d。
[Objective] The purpose of this study was to evaluate the environmental safety of diafenthiuron after it was used on cotton. Its residual activities and final residues on cotton in Shangqiu and Hangzhou were tested. [Method] The samples were extracted with acetonitrile, ammonium acetate and NaCl liquid, PSA and GCB, and the residual amount was determined by LC-MS / MS. [Result] The half-life of diafenthiuron on cotton leaves was 0.8-1.1 d, and the half-life in soil was 1.4-1.9 d. The residues of diafenthiuron in cottonseed after the last one application were 7, 14 and 21 d All ≤ 0.005 mg / kg. [Conclusion] It was suggested that 13% Biphenyl and Daphnuril EC could control cotton spider mite, and the pesticide should be applied once at the recommended dose with the safety interval of 7 d.