微量果汁中痕量乐果的快速质谱检测  

Rapid Determination of Dimethoate in Nanoliter of Juice Using Surface Desorption Atmospheric Pressure Chemical Ionization Mass Spectrometry

作　　者：王姜[1] 杨水平[1] 鄢飞燕[1] 刘艳[2] 李明[1] 宋宇航[1] 占叶兵[1] 陈焕文[1] 

机构地区：[1]东华理工大学应用化学系,抚州344000 [2]北京市理化分析测试中心,北京100089

出　　处：《分析化学》2010年第4期453-457,共5页Chinese Journal of Analytical Chemistry

基　　金：中国创新方法基金(No.2008IM040400);江西省教育厅科技项目(No.GJJ10504)资助

摘　　要：利用自行研制的纳升级微量取样器,建立了在无需样品预处理的前提下,对纳升级的市售果汁中痕量残留农药乐果进行快速分析的表面解吸常压化学电离质谱方法。实验结果表明,微量取样器的最小取样量为0.11nL,果汁样品中的乐果在0.0010～10.0mg/kg浓度范围内线性关系较好,相关系数为0.988,回收率为80.5%～120.6%,相对标准偏差为8.4%～17.2%,检出限可达1.2×10-11mg/kg。A method based on a nanoliter level sampling technique and desorption atmospheric pressure chemical ionization mass spectrometry（SDAPCI-MS） was developed for the rapid detection of trace dimethoate in juice without sample pretreatment.The precise sampling of untreated commercial juice samples was performed by using a homemade nanaoliter sampler（diameter of 80μm） ,which was made from a stainless steel needle.The minimum sampling volume was 0.11 nL.A good linearity of dimethoate signals was obtained in a range of 0.001-10.0 mg/kg with the correlation coefficient（R） of 0.988.The recoveries of real sample analysis were 80.5%-120.6%.The detection limit of dimethoate was 1.2×10-11 mg/kg for the juice sample.

关 键 词：纳升 表面解吸常压化学电离 质谱 乐果 果汁 

分 类 号：TS255.44[轻工技术与工程—农产品加工及贮藏工程]