电感耦合等离子体光谱法测定农业地质调查土壤样品中铈的不确定度评定

采用《测量不确定度评定与表示指南》，以等离子体发射光谱法测定土壤中的稀土元素铈为例，对测定结果进行不确定度评定。分析了不确定度的重要来源，包括溶液制备过程中引入的不确定度、样品称量引入的不确定度、标准物质外标法测量不确定度及仪器重复测定的不确定度。提供了引入不确定度各参数的采集和计算方法，对各不确定度分量进行分析计算，最后合成标准不确定度，通过乘以95％概率下的扩展因子2，获得测量结果的扩展不确定度。

Uncertainty Evaluation of Measurement Results of Cerium in Soil Samples from Agricultural Geologyical Survey by ICP-AES

Based on ,the measurement results of Ce in soil samples from agricultural geological survey by ICP-AES were collected and the measurement uncertainty was evaluated.The factor of instrumentation,standard reference materials used in the measurement,sample weighting,sample preparation and various chemical solution preparation etc.involved in the measurements were considered as the main sources contributing to the total uncertainty.The parameter collection and calculation of the fraction uncertainties were also discussed.Based on the evaluation of these fraction uncertainties the standard uncertainty of measurement results is obtained via synthesis of the fraction uncertainties.The extended uncertainty can be obtained via multiplying it by extended factor of 2 under the confidence probability of 95%.