气相色谱法同时测定枸杞中联苯菊酯、硫丹和高效氯氟氰菊酯的残留

Simultaneous Determination for Residues of Bifenthrin,Endosulfan and Lambdacyhalothrin in Chinese Wolfberry by GC

采用气相色谱法（GC）,建立枸杞中联苯菊酯、硫丹和高效氯氟氰菊酯残留的同时测定方法。用丙酮∶水（v/v,9∶1）提取枸杞中的农药残留,在Rtx-5色谱柱用丙酮∶水（v/v,9∶1）进行分离,电子捕获检测器（ECD）检测,在实现了3种农药的分离和测定。联苯菊酯、硫丹和高效氯氟氰菊酯的加标回收率为84.30%~98.60%,相对标准偏差（RSD,n=5）为2.5%~7.6%,最低检测浓度分别为0.04、0.04和0.02 mg/kg。检测方法快速、灵敏、可靠,能够用于枸杞中3种农药残留的同时检测。

A simultaneous determination method for the residues of bifenthrin, endosulfan and lambda-cyhalothrin in Chinese wolfberry was developed by using gas chromatography （GC）. The pesticide residues in Chinese wolfberry were extracted with a mixture of acetone and water （V/V=9：1）,then separated by the Rtx-5 column and detected by ECD detector. The results showed that the three pesticides could be well separated and detected within 20 min,the average spiked recoveries of bifenthrin, endosulfan and lambda-cyhalothrin ranged from 84.30%-98.60% with the relative standard deviation （RSD） of 2.5%- 7.6%, and the detection concentration were 0.04,0.04 and 0.02 mg,/kg respectively. This method is rapid, sensitive and reliable, which can be used to simultaneously detect the three pesticides in Chinese wolfberry.