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5～150ng／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。
The plant samples were decomposed by microwave digestion using H202-HNO3 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. 114Cd, 10B, 65Cu, 59Co, 52Cr, 98Mo, 7Li, 60Ni, 208Pb, 139La and 74Ge were chosen as determining isotopes and l03Rh and 45Sc 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.
出处
《岩矿测试》
CAS
CSCD
北大核心
2010年第1期17-22,共6页
Rock and Mineral Analysis
基金
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(2006-03)
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
inductively coupled plasma-mass spectrometry （ICP-MS）
microwave digestion
micro-amount of element
plant sample
