QuEChERS-气相色谱法测定牛奶中24种有机氯及菊酯类农药残留

建立QuEChERS快速净化结合气相色谱法测定牛奶中24种有机氯及菊酯类农药残留的分析方法。样品经乙腈提取,QuEChERS法净化,气相色谱-电子捕获检测器分析,外标法定量。结果表明,待测物质在5~250μg/L范围内线性关系良好,相关系数大于0.99,检出限为0.06~0.30μg/kg,样品加标平均回收率为85.5%~111.2%,相对标准偏差为3.2%~10.8%。该方法简单、准确、高效,可用于牛奶样品中有机氯及菊酯类农药残留的快速筛查和定量检测。

Determination of 24 Organochlorine and Pyrethroid Pesticide Residues in Milk by Modified QuEChERS Method and Gas Chromatography

In this study, a modified quick, easy, cheap, effective, rugged and safe (QuEChERS ) approach was applied for
the determination of 24 organochlorine pesticide and pyrethroid residues in milk samples by gas chromatography-electron
capture detector (GC-ECD). Milk samples were extracted with acetonitrile, purified with the modified QuEChERS approach,
and detected by GC-ECD. The external standard method was used for quantification. Excellent linearities were achieved for
all target analytes in the range of 5–250 μg/L with correlation coefficients greater than 0.99. The limits of detection (LODs)
ranged from 0.06 to 0.30 μg/kg. The recoveries were in the range of 85.5%–111.2%, with relative standard deviations (RSDs)
less than 11%. In summary, the proposed method was simple, accurate, efficient and adequate for the rapid screening and
quantitative analysis of organochlorine pesticide and pyrethroid residues in milk.