气相色谱法检测宁夏枸杞中联苯菊酯残留量

以宁夏中宁枸杞为研究对象,建立了检测枸杞中联苯菊酯残留量的毛细管气相色谱法.试样用乙腈提取,过CARB/NH2固相萃取柱,经丙酮/二氯甲烷净化洗脱,再过Florisil柱,经正己烷/二氯甲烷淋洗除杂,乙酸乙酯洗脱,正己烷定容,采用DB-1701毛细管色谱柱分离,GC-ECD进行分析.结果表明,中宁枸杞中联苯菊酯含量为0.002 2 μg/g,RSD为3.55％,样品加标回收率为92.47％,RSD为1.70％.该方法简便、快速、灵敏、准确,符合农药残留分析要求,研究结果为枸杞质量控制提供了一定的参考价值.

Determination of the Residue of Bifenthrin in Chinese Wolfberry of Ningxia by Gas Chromatography

The method for the determination of bifenthrin in Chinese wolfberry in Ningxia was developed by gas chromatography.The samples was extracted with acetonitrile,purified by the CARB/NH2 SPE column,and eluted with acetone-methylene chloride.Then the eluate was cleaned up by passing through a Florisil cartridge,which was washed with n-hexane-methylene chloride,and the analyte was eluted with ethyl acetate,and solubilized with n-hexane,finally analyzed with GC-ECD after isolated by DB-1701 capillary column.The amount of residue of bifenthrin in Chinese wolfberry was 0.002 2 μg/g and the RSD was 3.55%.The recovery was 92.47% and the RSD was 1.70%.The method was suitable for the detection of the residue of bifenthrin in Chinese wolfberry,which was simple,rapid,sensitive and accurate.The results could be useful for the quality control of Chinese wolfberry.