黄瓜与土壤中醚菌酯残留的气相分析方法研究

Determination of Kresoxim-methyl Residues in Cucumber and Soil by Capillary Gas Chromatography

[目的]建立黄瓜和土壤中醚菌酯残留检测方法。[方法]用乙腈提取黄瓜和土壤样品，经弗罗里硅柱净化后用气相色谱ECD检测器检测。[结果]在醚菌酯添加水平为0．05、0．20、0．50mg／kg3个浓度时，黄瓜中回收率为80．2％～114．O％，变异系数为2．1％～5．8％；土壤中回收率为95．1％-106．5％，变异系数为3．1％～7．3％，醚菌酯的最小检出量为2．5×10^-2ng，最低检出浓度为2．5μg／kg。[结论]该方法灵敏度高、检测限低、重现性好，完全能够满足黄瓜和土壤中醚菌酯残留的检测要求。

[ Objective ] The aim was to develop a method to determine kresoxim-methyl residues in cucumber and soil. [ Method] The cucumber and soil samples were extracted by acetonitrile, and then detected by capillarygas chromatography after florisil-phase extraction. [ Result ] Under the addition level of 0.05, 0.20, 0.50 mg/kg, the recovery rates of kresoxim-methyl in cucumber and soil samples were 80.2% -114.0%, 95.1% - 106.5% with RSD of 2. 1% -5.8% and 3.1% -7.3% respectively. The LOQ and LOD were 2.5 × 10 ^-2 ng and 2.5 μg/kg. [ Conclusion] This method was sensitive with low detectable limitation and good precision, which could be perfectly adopted in determining the kresoxim-methyl residues in cucumber and soil.