丁醚脲在棉花及土壤中的残留消解动态  

Residue Dynamics of Diafenthiuron in Cotton and Soil

作　　者：马婧玮 张军锋 李萌 李通 吴绪金 

机构地区：[1]河南省农科院农业质量标准与检测技术研究所,河南省粮食质量安全与检测重点实验室,农业部农产品质量安全风险评估实验室(郑州),郑州450002

出　　处：《农药》2014年第3期200-202,共3页Agrochemicals

基　　金：农业部农药检定所残留项目(2011P046)

摘　　要：【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0．8-1．1d；在土壤中的半衰期为1．4～1．9d；最后1次施药后间隔7、14、21d棉籽中丁醚脲的残留量均≤0．005mg／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7d。[Aims] Field trails for diafenthiuron residues in cotton and soil were conducted in Shangqiu and Hangzhou city to evaluate the environmental safety of diafenthiuron applying on cotton. [Methods] The sample was extracted with acetonitrile, followed by liquid liquid partition with ammonium acetate and sodium chloride. The upper layer was cleaned up by N-propylethylendiamine （PSA） and graphitized carbon black （GCB）, and then determined by LC-MS/MS. [Results] Two- year field trial results showed that the half-lives of diafenthiuron in cotton leaf and soil were 0.8-1.1 days and 1.4-1.9 days, respectively. The final residues in cotton seed samples were all under 0.005 mg/kg when samples were collected at 7, 14, 21 days after the last spray. [Conclusions] The results suggested that bifenthrin and diafenthiuron 13% EC can be used in cotton field for against tetranychus cinnabarinus at most one time and the pre-harvest interval should be 7 days.

关 键 词：丁醚脲 棉花 土壤 残留 

分 类 号：TQ450.263[化学工程—农药化工]