电感耦合等离子体质谱法同时测定植物类新食品原料中14种无机元素  

Simultaneous Determination of 14 Inorganic Elements in Plant-Original New Food Sources by ICP-MS

作　　者：韩芳[1] 宋伟[1] 吕亚宁[1] 丁磊[1] 周典兵 胡艳云 

机构地区：[1]安徽出入境检验检疫局食品安全分析与检测安徽省重点实验室,合肥230022

出　　处：《理化检验（化学分册）》2017年第12期1432-1436,共5页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家质检总局科技项目(2014IK134);安徽省自然科学基金(1408085MKL96);安徽省科技计划项目(1604b0602028;1606c08237)

摘　　要：0.500 0g样品经硝酸3mL、过氧化氢2mL消解后,采用电感耦合等离子体质谱法同时测定样品溶液中Na、Mg、Ca、Al、Cu、Zn、Fe、Mn、Se、Pb、Cd、As、Hg和Cr的含量。采用0.5%(体积分数)硝酸的基体酸度增强分析元素的信号强度;在两次测试之间用100μg·L-1 Au-5%(体积分数)硝酸溶液清洗仪器,降低Hg的吸附效应;利用甲烷碰撞动态反应池技术消除了分析过程中的质谱干扰,选择Sc、Y、In、Bi为内标元素校正基体效应。14种元素的质量浓度在一定范围内与信号强度呈线性关系,检出限(3s)在0.003~0.039μg·L^(-1)之间。方法用于分析国家标准物质GBW 10027,各元素测定值与认定值相符,测定值的相对标准偏差(n=6)在1.6%~14%之间。The sample（0.500 0 g）was digested with 3 mL of nitic acid and 2 mL of hydrogen peroxide,and Na,Mg,Ca,Al,Cu,Zn,Fe,Mn,Se,Pb,Cd,As,Hg,Cr in the sample solution were determined by ICP-MS.Acidity of φ 0.5% HNO_3 of the sample solution was adopted to enhance signal intensities of the 14 elements.The instrument was washed with 100μg·L^（-1） Au in φ 5% HNO_3 solution between 2 determinations to lower the adsorption effect of Hg.Mass spectral interference was eliminated using DRC mode with CH_4 as reaction gas.Sc,Y,In and Bi were selected as the internal standards to correct matrix effect.Linear relationships were found between signal intensities and mass concentrations of the 14 elements in definite ranges,with detection limits（3 s）in the range of 0.003-0.039μg·L^（-1）.The method was used to analyze a CRM numbered GBW 10027,giving determination values of 14 elements in consistency with the certified values and RSDs（n=6）in the range of 1.6%-14%.

关 键 词：电感耦合等离子体质谱法 无机元素 植物类新食品原料 

分 类 号：O657.63[理学—分析化学]