50%乙草胺水乳剂在花生田残留及消解动态  

Residue and Field Decline Study of Acetochlor 50% EW in Peanut Field

作　　者：李欣[1] 王彦辉[1] 周小毛[1] 柏连阳[1] 彭亚军[1] 蔡海林[1] 

机构地区：[1]湖南农业大学农药研究所,长沙410128

出　　处：《农药》2010年第12期904-905,908,共3页Agrochemicals

基　　金：国家现代麻类产业体系专项(nycytx-19-E09);国家自然基金资助项目(30971936)

摘　　要：采用气相色谱配电子捕获检测器(GC-ECD)测定乙草胺在花生田植株、壳、仁及土壤中消解动态和最终残留。花生植株、壳、仁样品用二氯甲烷提取,土壤用甲醇提取,经弗罗里硅土净化,GC-ECD检测,外标法定量。结果表明:当乙草胺添加水平在0.005～1.0 mg/kg范围之间,乙草胺在土壤、植株、花生仁、花生壳中平均回收率为85.3%～96.5%、81.5%～89.0%、85.4%～91.6%、78.5～85.3%。相对标准偏差分别为3.9%～5.0%、2.9%～8.9%、4.9%～12.1%、4.6%～5.7%。乙草胺的最小检出量(LOD)为0.5×10-11g;最低检测质量分数:土壤0.005 mg/kg,植株、花生仁和花生壳为0.01 mg/kg。乙草胺在郑州和长沙土壤中半衰期分别为2.8、3.3 d。Gas chromatography equipped with an electron-capture detector（GC-ECD） was conducted to reveal the residue dynamics final residues of acetochlor in peanut plant,peanut shell,peanut kernel and soil samples.Soil samples were extracted with methanol and other samples were extracted with methylene chloride.The extracts were cleaned up by florisil.Peanut samples were fortified with acetochlor at levels between 0.005 and 1.0 mg/kg.The recovery ranged from 85.3 to 96.5% for soil,81.5 to 89.0% for plant,85.4 to 91.6% for kernel,78.5 to 85.3% for shell with the relative standard deviations of 3.9 to 5.0%,2.9 to 8.9%,4.9 to 12.1% and 4.6 to 5.7% respectively.The limit of detection（LOD） of the method was 0.5×10-11 g.The limit of quantification（LOQ） was 0.005 mg/kg for soil,0.01 mg/kg for other sample.The half-life of acetochlor was 2.8 and 3.3 days in soil of Zhengzhou and Changsha.

关 键 词：乙草胺 花生 残留动态 消解动态 

分 类 号：TQ450.2[化学工程—农药化工]