苯酰菌胺在黄瓜及土壤中的残留动态

Residue dynamics of zoxamide in cucumber and soil

建立了气相色谱(GC)分析黄瓜及土壤中苯酰菌胺残留的方法。样品经乙腈提取,碱性氧化铝柱净化后用气相色谱仪的电子捕获检测器(GC/ECD)检测。结果表明:苯酰菌胺在0.002～0.100 mg.L-1范围线性关系良好,相关系数为1;苯酰菌胺在黄瓜及土壤中的最低检出质量分数为0.01 mg.kg-1;黄瓜中苯酰菌胺的平均添加回收率为89.4%～96.9%,变异系数为4.7%～10.9%;土壤中苯酰菌胺的平均添加回收率为90.1%～97.8%,变异系数为2.9%～4.5%。苯酰菌胺在黄瓜及土壤中的消解动态符合一级动力学方程,在黄瓜中的消解半衰期为1.3～3.3 d,土壤中的消解半衰期为1.6～5.6 d。

A method was developed to determine the residue of zoxamide in cucumber and soil by gas chromatography（GC）.The samples were extracted by acetonitrile,purified by column alumina-B and analyzed by gas chromatography with electron capture detection（GC/ECD）.The results showed that the linear ranges were 0.0020-0.1000 mg·L-1 for zoxamide,the coefficient of correlation was 1 and the limit of quantitation（LOQ） of residues in cucumber and soil was 0.01 mg·kg-1.The average recoveries and coefficient of variations of zoxamide of the method varied from 89.4% to 96.9% and 4.7% to 10.9% for cucumber samples,and 90.1% to 97.8% and 2.9% to 4.5% for soil samples.The degradation of zoxamide in cucumber and soil were conformed to the first-order dynamic equation.The half-life of zoxamide in cucumber and soil were 1.3-3.3 d and 1.6-5.6 d,respectively.