电感耦合等离子体质谱法测定岩石样品中15种稀土元素含量不确定度的评估

Uncertainty evaluation of 15 Rare Earth Elements in rock by ICP-MS

【研究目的】稀土元素在地球化学中占有重要的地位,其加和意义也很突出,堪称地球化学指示剂。敞口酸溶-电感耦合等离子体质谱法是测定岩石样品中稀土元素含量的常用方法。为提高岩石中稀土元素检测的准确性,实验从各分量进行测量不确定度的分析与评定。【研究方法】本文通过敞口酸溶-电感耦合等离子体质谱法测定岩石样品中稀土元素含量的不确定度来源,建立逐层分析和最后的评估。【研究结果】此方法的合成相对标准不确定度在0.0049~0.0091之间。【结论】该方法的不确定度主要来自样品的标准溶液,其中标准曲线拟合的贡献值最大,这与实验室中的实际测试情况是一致的。

This paper is the result of ICP-MS.[Objective]Rare earth elements play an important role in geochemistry,and their additive significance is also very prominent,which can be called geochemical indicators.The content of rare earth elements in rock samples was determined by ICP-MS with open acid solution-inductively,which is a common method.In order to improve the accuracy of detection of rare earth elements in rocks,the uncertainty of measurement is analyzed and evaluated from each component in the experiment.[Methods]The layer-by layer analysis and final evaluation are established based on the source,which is the content of rare earth elements in rock samples was determined by ICP-MS with open acid solution inductively.[Results]The results showed that the combined relative standard un‐certainties ranged from 0.0049 to 0.0091.[Conclusions]The uncertainty of this method mainly comes from the standard solution of the sample,and the contribution value of the standard curve fitting is the largest,which is consistent with the actual test situation in the laboratory.