地质标准物质不确定度评估方法初探

在分析地质标准物质标准值不确定度来源的基础上,提出了在多个实验室协作研制地质标准物质时,协作单位除提供重现性检测数据外,还应分别提供各项目检测数据的合成不确定度。分析方法或实验室之间的平均值的合成不确定度按不等精度方法处理。标准物质标准值的不确定度由分析方法、检测实验室、样品均匀性和样品稳定性的不确定度合成后乘以扩展不确定度置信水平下的包含因子而得。

Primary Investigation for Evaluation of Uncertainty of Geological Reference Materials

When certificating the geological reference materials by co-laboratory,the whole uncertainty of measurement results is influenced by many factors.The current methods for uncertainty calculation are difficult to cover all these factors.In this paper,under the full consideration of the contributors to the uncertainty in certification of geological reference materials,author proposes that laboratories should not only provide the repeatable examination data but also the combined uncertainty of determination data for each component.The combined uncertainty from average values by different analytical methods and from different laboratories should be handled by unequal accuracy method.The uncertainties of the certified values of the reference materials should be obtained from the combination of the uncertainties of analytical methods,examination laboratories,sample homogeneity,as well as sample stability and multiply by the coverage factors under confidence level of the extended uncertainties.