大豆中8种拟除虫菊酯类农药残留的毛细管气相色谱分析法

Simultaneous determination of eight pyrethroid residues in soybean using capillary gas chromatography

目的:建立毛细管气相色谱法同时测定大豆中8种拟除虫菊酯类农药残留(联苯菊酯、甲氰菊酯、三氟氯氰菊酯、氯菊酯、氟氯氰菊酯、氯氰菊酯、氰戊菊酯和溴氰菊酯)分析方法。方法:用乙氰提取大豆样品中的8种拟除虫菊酯类农药,经弗罗里硅土固相萃取柱净化后,毛细管色谱柱(HP-5)分离,ECD检测。结果:本方法分离效果好,8种拟除虫菊酯类农药的检出限为0.002 mg/kg～0.007 mg/kg,加标回收率平均值为69.4%～98.7%,相对标准偏差为5.2%～13.4%。结论:该方法快速,灵敏,准确,完全满足大豆中上述8种拟除虫菊酯类农药的测定要求。

Objeetive：A method using gas chromatography with electron capture detector （ECD） was developed for simultane- ous determination of eight pyrethroid residues （bifenthrin, fenpropathrin, cyhalothrin, permethrin, cyfluthrin, cypermethrin, fen- valerate and deltamethrin） in soybean. Methods： Eight pyrethroids were extracted with aeetonitrile from the powder of soybean, purified by the Florisil solid phase extraction cartridge, separated on capillary chromatography column （HP -5） and detected by ECD. Results： Eight pyrethroids were separated from each other. The detection limits varied between 0. 002 mg/kg and 0.007 mg/kg. The average recoveries of eight pesticides were between 69.4% and 98.7% with the RSDs ranging from 5.2% to 13.4%. Conclusion： The method was rapid, sensitive and accurate and suitable for the determination of eight pyrethroid resi- dues in soybean.