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微波消解-电感耦合等离子体质谱法测定植物样品中微量元素
引用本文:李刚,高明远,诸堃.微波消解-电感耦合等离子体质谱法测定植物样品中微量元素[J].岩矿测试,2010,29(1):17-22.
作者姓名:李刚  高明远  诸堃
作者单位:国土资源部成都矿产资源监督检测中心,四川,成都,610081
基金项目:四川省地质矿产勘查开发局《环境样品测试新技术研究》项目资助 
摘    要:采用过氧化氢-硝酸作溶剂,微波消解样品,外标方法校准,电感耦合等离子体质谱法同时测定植物样品中硼、镉、铜、钴、铬、钼、锂、镍、铅、镧、锗11个微量元素。确定了微波消解仪和等离子体质谱仪的最佳工作参数,研究了有机残留物和共存离子的干扰和消除方法,选择了各元素的测定同位素,以45Sc和103Rh双内标补偿基体效应,建立了样品测定方法。方法检出限(10s)在5~150 ng/g,相对标准偏差(RSD,n=12)在1.27%~5.27%。对多种国家一级生物标准物质进行分析验证,测定值与标准值相符。方法适用于植物的果实、根、茎、叶等不同类型样品中多种微量元素的测定。

关 键 词:电感耦合等离子体质谱法  微波消解  微量元素  植物样品
收稿时间:3/9/2009 12:00:00 AM
修稿时间:2009/6/10 0:00:00

Determination of Micro-amount of Elements in Plant Samples by Inductively Coupled Plasma-Mass Spectrometry with Microwave Digestion
LI Gang,GAO Ming yuan and ZHU Kun.Determination of Micro-amount of Elements in Plant Samples by Inductively Coupled Plasma-Mass Spectrometry with Microwave Digestion[J].Rock and Mineral Analysis,2010,29(1):17-22.
Authors:LI Gang  GAO Ming yuan and ZHU Kun
Institution:Chengdu Analytical & Testing Center for Minerals and Rocks, The Ministry of Land and Resources;Chengdu Analytical & Testing Center for Minerals and Rocks, The Ministry of Land and Resources;Chengdu Analytical & Testing Center for Minerals and Rocks, The Ministry of Land and Resources
Abstract:The plant samples were decomposed by microwave digestion using H_2O_2-HNO_3 as solvent. The external standard method was used for calibration. 11 micro-amount of elements of B, Cd, Cu, Co, Cr, Mo, Li, Ni, Pb, La and Ge in the plant samples were determined simultaneously by inductively coupled plasma-mass spectrometry (ICP-MS). The parameters for microwave digestion and ICP-MS instrumental operation were optimized by experiments. The interference from organic residues and coexistent ions on determination of Pb, Cd, Ni and the interference eliminating methods were studied. ~(114)Cd, 10B, ~(65)Cu, ~(59)Co, ~(52)Cr, ~(98)Mo, 7Li, ~(60)Ni, ~(208)Pb, ~(139)La and ~(74)Ge were chosen as determining isotopes and 103Rh and ~(45)Sc were chosen as internal standards. The detection limits (10SD) of method for 11 elements were in a range of 5 ng/g to 150 ng/g. The method has been validated by determination of these elements in National Standard Reference materials and the results are in agreement with certified values with precision of 1.27% to 5.27%RSD (n=12). The method is suitable for determining these micro-amount of elements in fruits, roots, stems and leaves of different plants.
Keywords:inductively coupled plasma-mass spectrometry (ICP-MS)  microwave digestion  micro-amount of element  plant sample
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