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气相色谱-飞行时间质谱快速鉴定和定量测定烟草中43种农药
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摘要
建立了烟草中43种农药的气相色谱-飞行时间质谱(GC-TOF MS)分析方法。采用改进的QuEChERS前处理方法,样品以丙酮-正己烷(1:1)进行萃取,萃取液经N-丙基乙二胺(PSA)吸附剂分散固相萃取净化后,用GC-NCI-TOF MS进行检测。通过高分辨飞行时间质谱的精确质量数测定,建立了农药的特征离子数据库,结合目标物保留时间、碎片离子的丰度比、裂解规律、同位素离子峰簇等进行目标物定性鉴定。配制基质匹配标准曲线,以磷酸三苯酯(TPP)为内标进行定量测定。43种农药的线性相关系数(r~2)均不小于0.993,相对标准偏差不大于9.6%,定量下限为1.3~5.0μg/kg;在3个水平下的加标回收率为76.4%~96.6%。该方法简单快速,准确性和灵敏度高,满足烟草中多农药残留的定性和定量检测要求。
A rapid and accurate method was developed for the analysis of 43 pesticide residues in tobacco based on gas chromatography- time of flight mass spectrometry(GC- TOF MS).By modified QuEChERS method,tobacco samples were extracted with acetone-hexane(1:1),and cleaned up with primary secondary amine(PSA),then detected by GC- TOF MS.Precise mass database of characteristic ions by TOF MS,coupled with retention time,fragment ion abundance ratios,fragmentation patterns of characteristic fragment ions,isotopic peak clusters were employed for the qualitative identification of pesticides.The quantatative method was established using the matrix-matched calibration standards with triphenyl phosphate(TPP) as the internal standard.The results indicated that the linear correlation coefficients(r~2) were not less than 0.993 with relative standard deviations(RSD) not more than 9.6%,and quantitation limits of 1.3-5.0μg/kg.The recoveries of 43 pesticides at three spiked concentration levels ranged from 76.4%to 96.6%.The method is simple,rapid,accurate and sensitive,and is appropriate for the determination of multi-residues in tobacco.
引文
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