异菌脲在梨和土壤中残留量的测定方法

建立了异菌脲在梨和土壤中气相色谱分析方法。梨、土壤样品用乙腈提取,Florisil固相萃取小柱净化,淋出液浓缩后用正己烷定容,气相色谱仪电子捕获器检测。试验结果表明,异菌脲的含量与峰面积之间呈线性关系,异菌脲的最小检出量为0.005ng。对于梨样本,异菌脲最低检测量为0.01mg/kg,添加平均回收率为94%～107%,变异系数为3.2%～6.5%;对于土壤样本,异菌脲最低检测量为0.01mg/kg,添加平均回收率为98%～110%,变异系数为4.0%～10.5%。结果表明该残留分析方法的灵敏度、准确度、精密度等均符合农药残留检测的要求。

Determination of iprodione residue in pear and soil

The analytical method of iprodione residue in pear and soil was established with gas chromatography.Iprodione was firstly extracted from pear and soil samples with acetonitrile,After being concentrated by evaporation,purified by the Florisil SPE column and detected by GC-ECD.The results showed that the linear relationship between peak area and iprodione content was good and the minimum detectable amount was 0.005 ng.For pear samples,the minimal determination concentration of this method was 0.01mg/kg,and the average recoveries were from 94% to 107% with RSD from 3.2% to 6.5%.For soil samples,the minimal determination concentration was 0.01mg/kg,and the average recoveries were from 98% to 110% with RSD from 4.0% to 10.5%.The sensitivity,accuracy and precision of this method are consistent with requirements of pesticide residue testing.