超高效液相色谱-串联质谱法测定水中拟除虫菊酯和有机磷农药残留

Determination of Pyrethriod Pesticide and Organic Phosphorus Pesticide Residues in Water by Ultra Performance Liquid Chromatography-Tandem Mass Spectrometry

采用直接进样法和萃取浓缩法2种前处理方式,通过超高效液相色谱-串联质谱法对水中20种拟除虫菊酯类和有机磷类农药进行了测定,并对仪器条件的选择和前处理条件的优化进行了探讨。结果表明,20种农药的线性关系良好,相关系数均>0.999,直接进样法检出限为0.21~2.47μg/L,回收率为81.0%~119%,相对标准偏差<10%。萃取浓缩法检出限为0.0022~0.0043μg/L,回收率为71.5%~115%,相对标准偏差<15%。该方法简便、快捷,精密度和准确度较高,可满足水中拟除虫菊酯类和有机磷类农药的检测要求。

A method for determination of 20 organic phosphorus and pyrethriod pesticides in water was established by using ultra performance liquid chromatography-tandem mass spectrometry after direct injection or after extraction and concentrated.The instrument conditions and pretreatment conditions were optimized.The regression equation of 20 kinds of pesticides showed good linear relationship,the correlation coefficients were all greater than 0.999.The detection limits were in the range from 0.21 to 2.47μg/L for direct injection,and the average recoveries ranged from 81.0%to 119%with the relative standard deviations less than 10%.For extraction and concentration method,the method detection limits of the target compounds were in the range from 0.0022 to 0.0043μg/L,and the average recoveries ranged from 71.5%to 115%with the relative standard deviations less than 15%.This method is simple and fast,and its precision and accuracy can meet the demands of determination of pyrethriod prsticide and organic phosphorus pesticide in water.