气相色谱-负化学电离质谱法测定茶叶中氟乐灵、三唑酮、丙溴磷的残留量

Determination of trifluralin、triadimefon and profenofos residues in Tea by GC/MS NCI

建立以固相萃取净化和气相色谱-负化学电离质谱(GC/NCI/MS)技术测定茶叶中氟乐灵、三唑酮、丙溴磷残留量的方法。样品经正己烷-丙酮(1+1)提取,共提物中的基体杂质经Cleanert TBT固相萃取柱去除,用负化学源质谱检测。氟乐灵、三唑酮、丙溴磷三种农药的方法回收率在74.3～98.1%之间,室内变异系数在6.2～12.5%之间(n=6),方法的检出限分别为1μg/kg、5μg/kg、10μg/kg。

A method for determination of trifluralin, triadimefon and profenofos residues in tea was described. It involved an extraction procedure with hexane -acetone （ 1＋1 ）, followed by Cleanert TBT solid phase extraction clean up and analysis by gas chromatography-negative chemical ionization mass spectrome try - in selective ion monitor （GC/MS-NCI-SIM）. The average recove rie s were 74.3- 98.1%.The relative standard deviations of the de tee tion re s μ Lts were 6.2 - 12.5% （ n=6 ） . The limit of de tec tion of trifluralin, triadimefon and profenofos was 1 μg/kg, 5 μg/kg, 10 μg/kg.