建立了蔬菜和水果中11种三唑类农药残留的气相色谱-质谱(GC—MS)测定方法。样品用乙腈均质提取,经石墨化炭黑/氨基复合柱净化,乙腈-甲苯(3:1)洗脱。洗脱液经浓缩、溶剂交换后定容,采用气相色谱-质谱的选择离子监测方式(GC—MSD/SIM)进行测定,内标法定量。方法的线性范围为0.05—5ng,相关系数为0.996—1.000,对甘蓝、番茄、苹果、柑橘、菠菜5种空白基质分别进行0.01、0.05、0.10mg/k3个水平加标,平均回收率为80%~97%,相对标准偏差(RSD,n=10)为2.5%~8.4%。11种农药的检出限均为0.01mg/kg。该方法操作简单,灵敏度高,结果准确可靠。
A method was developed for the determination of 11 triazole pesticides residues in fruits and vegetables using gas chromatography -mass spectrometry( GC -MS). The samples were homogemethod. The calibration curves of 11 triazole pesticides were linear in the range of 0.05 - 5 ng with correlation coefficients of 0. 996 - 1. 000. The spiked recoveries of 11 triazole pesticides from five matrices( e, g. cabbage, tomato, apple, orange, spinach ) at three spiked levels of 0. 01, 0. 05, 0. 10 mg/kg were in the range of 80% - 97% with relative standard deviations ( RSDs, n = 10) of 2.5% -8.4%. The limits of detection were 0.01 mg/kg for 11 triazole pesticides. The method is simple, sensitive, accurate and reliable.