土壤样品中稀土元素的高分辨电感耦合等离子质谱分析及其不确定度的评定探讨

REE analysis for the soil samples using HR-ICPMS and the evaluation of uncertainty

摘要: 在敞开体系中,用HF、HNO₃和HClO₄溶解电感耦合等离子体质谱法同时测定土壤样品中的15种稀土元素。在高分辨等离子体质谱仪(Element2)上建立了土壤样品中稀土元素含量的ICP-MS分析方法,经土壤国家一级标准物质分析验证,结果与标准值相符,测定的15种稀土元素的相对标准偏差均小于10%,加标回收率为96.5%~114.7%。实验表明,该方法不但操作简便快速,而且具有灵敏度高、检出限低,重现性好等优点,举例说明了测量不确定度的评定程序。

Abstract: A new method is developed for the determination of 15 REEs in the soil samples by using HR-ICPMS in the open systems.After crushed,the soil samples were digested by HF,HNO₃ and HClO₄.The experimental results show that the relative standard deviation values of these elements are less than 10%(n=6) and the recoveries vary between 96.5 and 114.7%.This method is simple and rapid,and has high sensitivity,low detection limit and good reproducibility.The procedure for the evaluation of uncertainty is also discussed in details exemplified by the determination of La in the soil samples.