凝胶渗透色谱净化—气相色谱法测定奶油中有机氯农药残留

作者采用凝胶渗透色谱（GPC）对奶油中8种有机氯农药进行样品前处理，气相色谱—电子捕获检测器进行测定，以保留时间定性，峰面积定量。在10~800 ng/mL浓度范围内，8种有机氯农药的线性良好，相关系数在0.9981~0.9996，回收率在92.4%～117.0%，RSD在1.83%～7.92%，方法检出限为0.65~2.33 μg/kg，满足奶油中有机氯农药残留检测要求。

Determination of Organochlorine Pesticides Residues in Fresh Cream by GPC Sample Clean-up and GC-ECD

The analysis of pesticides in food and environmental samples is an important part of monitoring the condition of the environment. Gel permeation chromatography (GPC) is a convenient technique to separate small molecules from high molecular weight organic matrices.In this application, eight organochlorine pesticides residues in fresh cream are cleaned up by a GPC system using Agilent EcoSpheres material and then determined by GC-ECD. DB-35ms Ultra Inert capillary GC column and Ultra Inert inlet liner are employed and provide excellent peak shape for this trace-level pesticides analysis. The linearity ranges from 0.9981 to 0.9996 over the concentration of 10~800 ng/mL. RSD were 1.83% to 7.92%.Method recovery and LOD are 92.4%~117.0% and 0.65 ~2.33 μg/kg, respectively.