分散固相萃取-气相色谱-质谱法测定地表水中的3种拟除虫菊酯含量

SPE-GC-MS Determination of 3 Pyrethroids in Surface Water

采用分散固相萃取-气相色谱-质谱法测定地表水中的3种拟除虫菊酯。以HC-C_(18)萃取剂为固相萃取填料,以二氯甲烷为洗脱剂对水样进行分散固相萃取。萃取液在HP-5MS石英毛细管柱上分离,质谱中采用电子轰击离子源和选择离子监测模式。在最优条件下,3种拟除虫菊酯的质量浓度在0.05~10.0μg·L^(-1)范围内呈线性,检出限(3S/N)在0.001~0.005μg·L^(-1)之间,方法用于实际水样的分析,加标回收率在95.0%~99.8%之间,测定值的相对标准偏差(n=6)在4.3%~11%之间。

GC-MS with dispersive solid phase extraction was applied to the determination of 3pyrethroids in surface water.The water sample was treated by passing a SPE column packed with HC-C_（18） as extractant.Dichloromethane was used as eluant.The eluate was separated on HP-5MS quartz capillary column.EI and SIM were adopted in MS.Under optimal conditions.Linearity ranges of the 3pyrethroids were same between 0.05-10.0μg·L^（-1）,with detection limits（3S/N）in the range of 0.001-0.005μg·L^（-1）.The proposed method was used for analysis of surface water samples,and recovery was tested by standard addition method,giving results in the range of 95.0%-99.8%,and RSDs（n=6）found were in the range of 4.3%-11%.