微波消解-电感耦合等离子体-质谱和原子荧光光谱测定海产品中总砷含量差异的研究  

Comparative Study on Determination of Total Arsenic in Sea Products by Microwave Digestion-Inductively Coupled Plasma-Mass Spectrometry and Atomic Fluorescence Spectrum

作　　者：解楠[1] 徐红斌[1] 胡其敏[1] 李亦奇[1] 

机构地区：[1]国家食品质量监督检验中心(上海)/上海市质量监督检验技术研究院,上海市徐汇区苍梧路381号200233

出　　处：《光谱实验室》2011年第2期645-649,共5页Chinese Journal of Spectroscopy Laboratory

摘　　要：对电感耦合等离子体-质谱和原子荧光光谱测定海产品中总砷的方法及结果进行了比较。HNO3-H2O2混合体系微波消解处理样品,总砷采用在线加内标、碰撞池模式、ICP-MS测定和加入预还原剂-氢化物发生原子荧光光谱测定,两种方法校准曲线的相关系数均大于0.9995,检出限分别为0.0023μg/L和0.029μg/L,加标回收率均在97.0%—106.7%之间,精密度分别为1.29%和2.00%,前后两种方法测定紫菜总砷的含量分别是9.41mg/kg和2.42mg/kg,测定鱼片中总砷的含量分别为1.48mg/kg和0.024mg/kg。针对几种不同砷化合物进行了微波消解后,两种测定方法的比较,试图分析并解释引起测定结果差距显著的原因。A methodological comparison between inductively coupled plasma-mass spectrometry and atomic fluoresence spectrometry was occured for determination of total arsenic in sea products.The samples were digested by HNO3-H2O2.The internal standard added on line and octupole reaction system were used for ICP-MS,and adding before-reducing agent-hydride generation were for atomic fluorescence spectrum.The calibration curve coefficient results of two methods were greater than 0.9995,and the limits of detection were estimated to be 0.0023μg/L and 0.029μg/L.The standard recoveries for samples were in the range of 97.0%—106.7%.The precision of samples were 1.29% and 2.00%,respectively.The content of total arsenic in laver determined by inductively coupled plasma mass spectrometry and atomic fluorescence spectrum were 9.41mg/kg and 2.42mg/kg,respectively,and total arsenic in fish were 1.48mg/kg and 0.024mg/kg.Some different arsenic compounds after microwave digestion were determined by these two methods,and this could be applied to analyze and explain that why there was observably different results.

关 键 词：总砷 海产品 原子荧光光谱 电感耦合等离子体-质谱 有机砷 

分 类 号：O657.31[理学—分析化学] O657.63[理学—化学]