ICPAES法测定超基性岩中13元素的方法研究

采用HCl-HNO3-HF-HCl O4,HCl-HNO3-HF-H2SO4敞口,HCl-HNO3-HF-HCl O4密闭和HNO3-HF密闭消解4种方法溶矿,利用电感耦合等离子体发射光谱(ICP-AES)测定,建立了超基性岩石中钾、钠、钙、铝、铁、钛、锰、钴、镍、铬、钒、锶、锌等元素的同时测定方法。对电感耦合等离子体发射光谱仪测定的最佳仪器条件及分析谱线进行了选择,并对镁基体的影响进行了研究,采取标准溶液中加入适量的镁作基体匹配,以消除基体影响。实验结果表明:采用HNO3-HF密闭溶矿,具有检出限低、灵敏度高,操作简便、快速等突出优点。该方法测定值与推荐值基本吻合,分析方法的精密度满足《地质矿产实验室测试质量管理规范》的要求。

Study on Determination of 13 Elements in Ultrabasic Rock by Using ICP-AES Method

By using HCl-HNO3-HF-HClO4, HCl-HNO3-HF-H2SO4 under the open conditon, HCl-HNO3-HF-HClO4 under the closed condtion, and HNO3-HF under closed and resoluted condtion to dissolve the ores, using inductively coupled plasma emission spectroscopy (ICP-AES), the method which will measure potassium, sodium, calcium, aluminum, iron, titanium, manganese, cobalt, nickel, chromium, vanadium, strontium, zinc and other elements in the ultrabasic rocks at the same time has been established. The best instrument conditions and analytical spectral lines for measurements by using inductively coupled plasma emission spectrometer have been selected, and the influence of the magnesium substrate has been studied as well. Adding right amount of magnesium to standard solution as the matrix matching can eliminate the matrix effect. As showed by the experimental results: the method of using HNO3-HF to dissolve ores under closed condtion has many advantages, such as low detection limit, high sensitivity, simple operation and rapid. By using this method, the measured value can fit the recommended value basically, and the precision of the method can satisfy demand of "Test Quality Management Standard of Geology and Mineral Resources Laboratory ".