GC-MS法测定银杏叶中3种氨基甲酸酯类农药的残留量

目的: 建立银杏叶中3种氨基甲酸酯农药残留量的测定方法。 方法: 样品以丙酮超声提取,并采用弗罗里硅土柱进行净化,选用气相色谱与质谱串联技术(GC-MS)在DB-5MS毛细管柱上用程序升温技术分离,采用选择离子检测方式,以保留时间和特征离子进行目标成分的定性鉴别,外标法对样品进行测定。 结果: 3种氨基甲酸酯农药在100~1000 μg·L^-1范围内呈良好的线性关系,3种农药的方法定量限在5.0~6.0 μg·kg^-1,3个水平添加回收率在83.30%~89.53%之间,RSD小于10%(n= 9)。 结论: 本方法灵敏度高,重现性好,可用于银杏叶中3种氨基甲酸酯类农药残留的检测。

Objective: To establish an analytical method for the simultaneously determination of 3 Carbamate in Ginkgo biloba. Methods: The sample was extracted with acetone,and the extract was cleaned using Florisil,The eluate was concentrated under nitrogen blowing.Based on GC-MS,the pesticides were separated with a DB-5MS column using a temperature program and were detected with a mass selective detector in selective ion monitoring(SIM)mode.The target pesticides were identified by comparing their retention times and characteristic ions with reference. Results: The linearity of the method was good within 100 and 1000 μg·L^-1,and all the limits of quantification(LOQs)were within 5.0 and 6.0 μg·kg^-1.The average spiked recoveries in three levels were 83.30%-89.53% with relative standard deviations(RSD)below 10%(n=9). Conclusion: The method is sensitive for the residue analysis of 3 Carbamate in Ginkgo biloba.