拟除虫菊酯类农药在人参中的多残留方法研究

The Study on a Method for Determining Multi-residues of Pyrethroid Pesticides in Ginseng

建立了人参样品中氯菊酯、联苯菊酯、氟氯氰菊酯、氰戊菊酯、溴氰菊酯、甲氰菊酯和三氟氯氰菊酯7种拟除虫菊酯类杀虫剂的多残留气相色谱分析方法(GC),用乙腈提取人参样品,石墨炭黑-氨基串联柱净化,经DB-1701石英毛细管柱(30m×0.25mm×0.25μm)分离后,采用GC-μECD测定。结果表明在0.05～1mg/kg的线性范围内,相关系数(r)分别为0.9993、0.9995、0.9992、0.9996、0.9988、0.9993、0.9993。测定结果高、中、低3个水平的平均回收率在79.1%～103.3%之间,相对标准偏差(RSD)在3.6～9.7之间,检出限在0.0008～0.03mg/kg之间。方法简便、快速、净化效果好,适合人参中痕量拟除虫菊酯类农药残留的同时测定。

The aim was to develop a method for determining multi-residues of permethrin,bifenthrin,baythrioid,fenvalerate,deltamethrin,fenpropathrin,lambda-cyhalothrin in Ginseng samples by using Gas Chromatography （GC）.Sample was extracted by acetonitrile,cleaned up with a CARB/NH 2 column,followed by separation on a DB-1701 capillary column,and then detected by GC-μECD.A mixed standard solution prepared from primary standards of the 7 pesticides,and calibration curve for each of the 7 pesticides was prepared covering the concentration ranges of 0.05 to 1 mg/kg.The correlation coefficients of these calibration curves were 0.9993,0.9995,0.9992,0.9996,0.9988,0.9993 and 0.9993,respectively.The recoveries of 3 standard addition levels of high,medium,low concentrations were 79.1%-103.3%,with relative standard deviations from 3.6 to 9.7,the detection limits were from 0.0008 to 0.03 mg/kg for pyrethroid pesticides.The method was simple,fast,accurate and suitable for detecting the residues of pyrethroid pesticides in ginseng.