气相色谱-四级杆质谱分析土壤和玉米中精异丙甲草胺和特丁津的残留

Determination of S-metolachlor and Terbutylazine Residues in Soil and Corn by Gas Chromatography-Quadrupole Mass Spectrometry

建立气相色谱-质谱同时检测土壤和玉米中精异丙甲草胺和特丁津的残留分析方法。土壤和玉米样品各10.0g经10mL乙腈提取,50mg PSA净化,以气质联用选择离子定性和定量,操作简单,精密度好,准确度高。土壤、玉米中精异丙甲草胺和特丁津0.01、0.05、0.1mg/kg三个浓度的添加回收率均在90.4%～108.5%之间,变异系数在1.9%～5.3%之间。

An internal standard method for the determination of S-metolachlor and terbutylazine residues in soil and corn by gas chromatography-quadrupole mass spectrometry was developed.S-metolachlor and terbutylazine were extracted with acetonitrile by vortex and cleaned-up with base sorbent（primary secondary amine exchange material-PSA）.The recoveries of S-metolachlor and terbutylazine in soil and corn were between 90.4% and 108.5%,and the relative standard deviations（RSDs） were between 1.9% and 5.3%,respectively.