钒酸铵容量法测定岩石矿物中铀的不确定度评定

Uncertainty Evaluation on the Determination of Uranium Ores by Volumetry of Ammonium Vanadate

根据核工业行业标准"硫酸亚铁还原/钒酸铵氧化滴定法测铀"(EJ267.2-84)进行不确定度评定。通过不确定度来源识别,不确定度分量的量化,并以标定好的钒酸铵溶液滴定铀质量分数,得出方法本身带来数据的不确定度。对整个过程的不确定度来源和大小进行分析研究,应用统计学基础对数据进行科学处理。报告出了不同铀质量分数的合成标准不确定度和扩展不确定度。

Uncertainty evaluation on the criteria of ＂ferrous sulfate deoxidization / ammonium vanadate oxidation titrimetry to measure uranium＂ （EJ267.2-84） issued by Ministry of Nuclear Industry was analyzed. The uncertainty brought by the method itself was obtained through the identification of uncertainty sources, quantification of uncertainty components and determination of uranium content by titration with calibrated ammonium vanadate solution. With the analytical study to uncertainty sources of entire process and components, and the application of statistical treatment based on scientific data, the combined stand- ard uncertainty and expanded uncertainty about different levels of uranium content was reported.