蔬菜中菊酯类农药残留量的监测

The Monitoring Pyrethroid Pesticide Residue in Vegetables

研究了蔬菜中菊酯类农药残留量的气相色谱监测方法。采用乙腈作为提取剂。蔬菜样品经处理后,注入气相色谱仪中,采用石英毛细管柱,电子捕获检测器检测,用外标法定量。结果表明:甲氰菊酯的回收率为84.2%～100.6%,RSD为1.83%～5.47%;氯氰菊酯的回收率为84.7%～102.7%,RSD为1.05%～4.11%;氰戊菊酯的回收率为87.8%～103.7%,RSD为2.58%～3.87%;溴氰菊酯的回收率为83.0%～101.2%,RSD为1.98%～4.86%。该方法快速、简便、选择性好,监测结果准确可靠。

A method for monitoring pyrethroid pesticide residue in vegetables by gas chromatography was studied.Acetonitrile was taken as the extractant.After the samples were dealt with,hey were poured into the gas chromatography apparatus.The quartz capillary vessel column was used,and we examined it with the electron capture detector,using an external standard for quantification.The result indicated that the recoveries of the fenpropathrin ranged from 84.2% to 100.6%,with a RSD of 1.83%to 5.47%;the recoveries of cypermethrin ranged from 84.7% to 102.7%,with a RSD of 1.05% to 4.11%;the recoveries of the fenvalerate ranged from 87.8% to 103.7%,with a RSD of 2.58% to 3.87%;the recoveries of deltamethrin ranged from 83.0% to 101.2%,with a RSD of 1.98% to 4.86%.The method was simple,fast,and the selectivity was good.The monitoring result was accurate and reliable.