等离子体发射光谱法测定土壤和沉积物中6个常量元素结果不确定度评定

采用等离子体发射光谱法对测定土壤和水系沉积物中铝、铁、钙、镁、钾、钠6个常量元素进行系统的不确定度评定。不确定度的来源主要包括分析过程中所用的天平、玻璃器皿、标准曲线、标准溶液、试液定容体积及测量重复性等引入的不确定度分量。计算出各分量的不确定度,通过合成得到测量结果的合成不确定度、扩展不确定度及测试结果的报告形式。

Uncertainty Evaluation for the Determination Results of Major Elements in Soil and Sediment Samples by Inductively Coupled Plasma-Atomic Emission Spectrometry

The measurement uncertainty for the analytical results of major elements including Al,Fe,Ca,Mg,K and Na in soil and stream sediment samples determined by inductively coupled plasma-atomic emission spectrometry(ICP-AES) was evaluated.The main sources of measurement uncertainty came from sub-uncertainties of the analytical balance,analytical glassware,calibration solutions,calibration curves,reagent volume and repetitive measurements.Each sub-uncertainty was calculated and the composed uncertainty and expanded uncertainty of the measurement results were obtained by combining the sub-uncertainties.