单 位：
沃特世科技(北京)有限公司;仲恺农业工程学院化学化工学院沃特世科技(北京)有限公司
关键词：
精确质量数;残留分析;基质固相分散;超高效液相色谱(UPLC);有机磷农药
摘 要：
[目的]建立利用超高效液相色谱-高分辨飞行时间质谱同时检测草莓中敌敌畏、毒死蜱、乐果、氧乐果4种有机磷农药残留的方法。[方法]试样经改进的基质固相分散法进行前处理,超高效液相色谱-高分辨飞行时间质谱法测定,外标法定量。[结果]4种有机磷农药在质量浓度10~250μg/L范围内线性关系良好(r2>0.99),定量下限均为10μg/kg,平均加标回收率为78%~107%,相对标准偏差为3.4%~8.6%。[结论]该方法简便、快捷、可靠、稳定,可用于草莓中敌敌畏、毒死蜱、乐果、氧乐果4种有机磷农药的快速检测与确证。
译 名：
Determination of 4 Pesticide Residues in Strawberry Using MSPD/UPLC-TOFMS
作 者：
LU Hong1,WU Guo-jie1,LIANG Shi-qiang1,BAI Xu2(1.Department of Chemistry and Chemical Engineering,Zhongkai University of Agriculture and Technology,Guangzhou 510225,China;2.Waters Technologies(Beijing) Limited,Beijing 100026,China)
关键词：
accurate mass;residual analysis;matrix solid-phase dispersion(MSPD);ultra performance liquid chromatography(UPLC);organophosphorus pesticide
摘 要：
An ultra performance liquid chromatography(UPLC)-high resolution time-of-flight mass spectrometer(TOFMS) method was developed for the simultaneous determination of dichlorvos,chlorpyrifos,omethoate,and dimethoate residues in strawberry.[Methods] The improved matrix solid-phase dispersion(MSPD) method was used for sample pretreatment.The sample was detected by UPLC-TOFMS and quantified with external standard method.[Results] The calibration curves of 4 organic phosphorous pesticides were linear in concentration range from 10 to 250 μg/L with correlation coefficients above 0.99.The limit of detection was 10 μg/kg.The average recoveries from vegetable at spiked concentration levels ranged from 78 to 107%.The relative standard deviations of the method were between 3.4 and 8.6%.[Conclusions] This method was simple,efficient and accurate.Therefore,it was practicable in the trace determination of dichlorvos,chlorpyrifos,omethoate,and dimethoate in strawberry.
