甘薯和土壤中灭线磷残留测定方法

［目的］为甘薯和土壤中灭线磷的残留检测提供分析方法。［方法］样品经丙酮提取，提取液用石油醚液-液分配，中性氧化铝（含活性炭）柱层析净化，气相色谱测定。［结果］灭线磷的最小检测量为1×10^-12g，最低检测浓度为0.2 μg/kg。添加浓度在0.01～1.0mg/kg时，甘薯植株中灭线磷的添加回收率为88.3%～91.1%，变异系数为4.5%～9.3%；土壤中的添加回收率为85.2%～88.3%，变异系数为7.0%～7.5%；甘薯块茎中的添加回收率为82.5%～88.0%，变异系数为4.8%～7.1%。［结论］该方法的准确性、精确性和灵敏度均达到农药残留分析的要求。

Analytical Method of Ethoprophos Residue in Sweet Potato and Soil

[Objective]The aim of the study was to provide a valuable method for determination of ethoprophos residue in sweet potato and soil.[Method] Residues of ethoprophos were extracted from sweet potato and soil with acetone, cleaned up by column chromatography of Al2O3, and determined with GC equipped by FPD.[Result] The minimum detectable amount of ethoprophos was 1×10-12g, and the minimum detectable concentration of ethoprophos in the samples of sweet potato and soil was 0.2 μg/kg.The average recovery and coefficient of variation of the method were 88.3%-91.1% and 4.5%-9.3% for sweet tomato plant samples, 85.2%-88.3% and 7.0%-7.5% for soil samples, and 82.5%-88.0% and 4.8%-7.1% for sweet tomato tuber samples, respectively.[Conclusion] The method accorded with demands of residue analysis of pesticide.