CAJ | 학술논문

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~(45)Sc和~(103)Rh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.
채용과양화경-초산작용제,미파소해양품,외표방법교준,전감우합등리자체질보법동시측정식물양품중붕、력、동、고、락、목、리、얼、연、란、타11개미량원소.학정료미파소해의화등리자체질보의적최가공작삼수,연구료유궤잔류물화공존리자적간우화소제방법,선택료각원소적측정동위소,이~(45)Sc화~(103)Rh쌍내표보상기체효응,건립료양품측정방법.방법검출한(10s)재5～150 ng/g,상대표준편차(RSD,n=12)재1.27%～5.27%.대다충국가일급생물표준물질진행분석험증,측정치여표준치상부.방법괄용우식물적과실、근、경、협등불동류형양품중다충미량원소적측정.
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.