微波消解-原子荧光光谱法同时测定植物源性食品中的痕量硒和锗  

Simultaneous Determination of Trace Selenium and Germanium in Plant-based Foods by Microwave Digestion-Atomic Fluorescence Spectrometry

作　　者：袁源 陈海杰[2] 蒲海钦 李根 YUAN Yuan;CHEN Haijie;PU Haiqin;LI Gen(Analytical and Testing Center of Southwest Metallurgical Geology,Chengdu 611730;Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000)

机构地区：[1]西南冶金地质测试中心,四川成都611730 [2]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000

出　　处：《分析科学学报》2020年第6期889-894,共6页Journal of Analytical Science

基　　金：中央级公益性科研院所基本科研业务费专项基金(No.AS2016J13)。

摘　　要：建立了原子荧光光谱法同时测定植物源性食品中的痕量硒和锗的分析方法。样品采用微波消解处理,以低浓度硫脲为预还原剂,H3PO4为介质,分析了双道仪器同时测定硒和锗的有效性。系统地研究并确定了方法的最优条件,采用国家一级标准物质对方法性能进行了考察,方法检出限(MDL,稀释因子20倍)为硒0.0015 mg/kg、锗0.0038 mg/kg,相对标准偏差(RSD,n=10)为4.9%~10.7%,相对误差(RE)为-12.1%~14.7%。结果表明,方法技术参数能够满足食品检测相关标准和规范的要求,方法能实现硒和锗的同时测定。The objective of this work is to examine the availability of simultaneous determination of trace selenium(Se) and germanium(Ge) in plant-based foods by dual channel atomic fluorescence spectrometry.An analytical method was established which involved HNO3-H2O2 microwave digestion and then reduction by low concentration thiourea in H3PO4 medium.The optimal conditions of the method were systematically studied.Furthermore,its technical parameters were investigated through using first-class national standard reference materials.The method detection limits for Se and Ge(dilution factor=20) were 0.0015 mg/kg and 0.0038 mg/kg,respectively.The range of precision(RSD,n=10) was 4.9%-10.7% and the range of accuracy(RE) was-12.1%-14.7%.The results indicate that the technical parameters can meet the requirements of relevant standards for food testing and the method can improve the efficiency of testing by simultaneously determining Se and Ge.

关 键 词：硒 锗 植物食品 原子荧光光谱法 技术参数 

分 类 号：O657.31[理学—分析化学]