超高效液相色谱-串联质谱法测定复杂基质食品中二硝基苯胺类除草剂残留量

建立了测定茶叶、大豆和鸡肝等复杂基质食品样品中8种二硝基苯胺类除草剂(氟乐灵、二甲戊乐灵、仲丁灵、异乐灵、磺乐灵、氨基乙氟灵、氨磺乐灵和氨基丙氟灵)残留的超高效液相色谱-串联质谱检测方法。分析物采用电喷雾电离,正离子扫猫,多反应监测(MRM)模式检测,外标法定量。8种二硝基苯胺类除草剂的定量下限均为0.010 mg/kg。在0.010~0.100 mg/kg加标范围内,回收率为75.9%~113%,相对标准偏差为1.7%~19.0%。该方法高效、灵敏,适用于茶叶、大豆和鸡肝等复杂基质食品中二硝基苯胺类除草剂多残留的测定。

Simultaneous Determination of Dinitroaniline Herbicides in Complex Matrix by Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry

A method was developed for the determination of 8 kinds of dinitroaniline herbicides,including trifluralin,pendimethalin,butralin,isopropalin,dinitramine,nitralin,oryzalin and prodiamine in complex matrices(tea,soybean and chicken livers) by ultra performance liquid chromatography-tandem mass spectrometry(UPLC-MS/MS).Qualification and confirmation were achieved by electro spray ionization(ESI) in positive mode using multiple reaction monitoring(MRM),and the external standard method was uesd for quantitation.The limits of quantitation were all 0.010 mg/kg.The recoveries of dinitroaniline herbicide residues were between 75.9% and 113% at spiked levels of 0.010-0.100 mg/kg.The RSDs of the method were between 1.7% and 19.0%.The method is precise and sensitive,and is suitable for both confirmation and quantification of trifluralin,pendimethalin,butralin,isopropalin,dinitramine,nitralin,oryzalin,prodiamine in tea,soybean and chicken livers.