凝胶渗透色谱-气相色谱质谱法测定：花生中6种除草剂农药残留

建立了凝胶渗透色谱一气相色谱质谱（GPC～GC=MS）法测定花生中6种除草剂（氟乐灵、异恶草酮、甲草胺、二甲戊乐灵、乙氧氟草醚、喹禾灵）农药残留的方法。样品经乙腈提取，氨基固相萃取柱和凝胶渗透色谱净化，在选择离子扫描（SIM）模式下进行气相色谱质谱法测定，外标法定量。6种除草剂浓度在0．02-1．00mg／L范围内与色谱峰面积呈良好的线性，线性相关系数为O．9949～0．9998，添加回收率为77．8％-101．6％，测定结果的相对标准偏差为4．4％～11．4％（月=5），方法的检出限为0．1～1．3μg／kg。

Determination of 6 Pesticide Residues in Peanut Using Gel Permeation Chromatography and Gas Chromatography-Mass Spectrometry

A method was developed for the determination of 6 pesticides （trifluralin, clomazone, alachlor, pendimethalin, oxyfluorfen, quizalofop） in peanuts by gel permeation chromatography and gas chromatography-mass spectrometry（GPC-GCMS）. The herbicide pesticide residues were extracted by acetonitrile. The extract was cleaned up with NH2 solid-phase extractor and gel permeation chromatography（GPC）, then analyzed by gas chromatography-mass spectrometry（GC / MS） under selected ion monitoring（SIM） mode. The pesticide residues were; calculated by external standard method. Good linear relation was obtained in the range of 0.02 -1.00 rng / L with the correlation coefficient of 0.994 9-0.999 8. The average recoveries of six pesticides were 77.8%-101.6% with RSD of 4.4%-11.4%（n=5）. The detection limit was 0.1-1.3μg / kg.