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采用气相色谱-电子捕获检测器(GC-ECD)法建立了同时测定瓜果类蔬菜中15种除草剂(氟嘧磺隆、草毒死、敌草隆、氯草定、氟乐灵、炔苯酰草胺、乙草胺、甲草胺、异丙甲草胺、吡唑草胺、硝草胺、丁草胺、丙草胺、齅草酮、吡氟酰草胺)残留量的方法。供试番茄、黄瓜、青椒、茄子、西葫芦、马铃薯、芸豆及萝卜8种样品经乙酸乙酯与二氯甲烷混合溶剂提取,Florisil PR固相萃取柱净化,DM-1毛细管气相色谱柱(30 m×0.32 mm,0.25μm)分离,GC-ECD测定,外标法定量。结果表明:在0.002~0.5 mg/kg的3个添加水平下,15种除草剂在8种蔬菜中的平均添加回收率为77%~113%,相对标准偏差(RSD)为3.5%~10.8%,定量限为0.001~0.1 mg/kg。采用所建立的方法对市售蔬菜样品进行测定,结果表明,15种除草剂的残留量均小于最大允许残留限量。该方法简单、快速,灵敏度高,适用于同时测定瓜果类蔬菜样品中15种除草剂的残留量。
Gas chromatography-electron capture detector (GC-ECD) was used to establish a method for the simultaneous determination of 15 herbicides (vezosulfuron, turpentine, diuron, Phenacetamide, acetochlor, alachlor, metolachlor, verapamil, pendimethalin, butachlor, pretilachlor, humulone, and diflufenican) . Eight samples of tomato, cucumber, green pepper, eggplant, zucchini, potato, kidney bean and radish were extracted with a mixed solvent of ethyl acetate and methylene chloride. Florisil PR solid phase extraction column was used to purify. × 0.32 mm, 0.25μm) separation, GC-ECD determination, external standard quantitative. The results showed that the average recoveries of 15 herbicides were 77% -113% and the relative standard deviations (RSDs) were 3.5% -10.8% at the three levels of 0.002-0.5 mg / kg. , The limit of quantification was 0.001 ~ 0.1 mg / kg. The established method for the determination of commercially available vegetable samples showed that the residues of the 15 herbicides were less than the maximum allowable residue limit. The method is simple, rapid and sensitive. It is suitable for the simultaneous determination of residues of 15 herbicides in fruits and vegetables.