Uncertainty evaluation during determination of tungsten content in cobalt-chromium-tungsten alloy powder by inductively coupled plasma atomic emission spectrometry
LUO Haixia1,2
1. BGRIMM MTC Technology Technical Co.,Ltd.,Beijing 102628,China; 2. Bejing Key Lab of Mineral Resource Evaluation ＆ Analysis,Beijing 102628,China
Abstract：The content of tungsten in cobalt-chromium-tungsten alloy powder samples was determined by microwave digestion-inductively coupled plasma emission spectrometry (ICP-AES). The quantitative mathematical model of this method was established, and the calculation formula of uncertainty was deduced. The main source of uncertainty in the detection process was found out, which mainly included the uncertainty components introduced in the preparation process of standard solution, the weighing process, the constant volume process of solution, the fitting process of calibration curve, and the process of repeated measurement. According to JJF 1059.1-2012 Evaluation and expression of uncertainty in measurement, the main factors affecting the uncertainty were analyzed one by one. Each uncertainty component was quantitatively calculated. Finally, the synthetic standard uncertainty and extended uncertainty were obtained, and the measurement results were provided. The results showed that the preparation process of standard solution, the fitting process of calibration curve, and the process of repeated measurement were main sources of uncertainty. The determination results of tungsten in cobalt-chromium-tungsten alloy powder by ICP-AES were satisfactory. This method provided certain reference for the uncertainty evaluation during determination of tungsten by ICP-AES.
[1] 国家质量技术监督局计量司.测量不确定度评定与指南[M].北京:中国计量出版社,2000. [2] 中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.GB/T 27025-2008 检测和校准实验室能力的通用要求[J].北京:中国标准出版社,2008. [3] 顾业青,冯丽兵.测量不确定度在测量结果合格评定中的应用分析[J].内燃机与配件(Internal Combustion Engine & Parts),2013(9):50-51. [4] 中华人民共和国工业和信息化部.YS/T 1489.3—2021 钴铬钨系合金粉末化学分析方法 第3部分:钨含量的测定 电感耦合等离子体原子发射光谱法[S].北京:冶金工业出版社,2021. [5] 国家质量监督检验检疫总局.JJF 1059.1—2012 测量不确定度评定与表示[S].北京:中国质检出版社,2012. [6] 国家质量监督检验检疫总局.JJG 1135—2005 化学分析测量不确定度评定[S].北京:中国标准出版社,2005. [7] 曹宏燕.分析测试中测量不确定度及评定 第三部分 分析测试中主要不确定度分量的评定[J].冶金分析,2005,25(3):82-87. CAO Hongyan.Uncertianty in measurement and its evaluation in analysis and testing Part 3 Evaluations of f main components of uncertainty in analysis and measurements[J].Metallurgical Analysis,2005,25(3):82-87. [8] 国家计量检定规程.JJG 196—2006常用玻璃量器[S].北京:中国标准出版社,2006.
