原子吸收分光光度法测定钼矿石中铜含量的不确定度评定

Evaluation on Uncertainty of Copper Content in Molybdenum Ores Measured by Flame Atomic Absorption Spectrophotometry

本文根据GB/T 14352.3-2010《钨矿石、钼矿石化学分析第3部分:铜量测定》对钼矿石中的铜含量进行测试,分析了测试过程中主要不确定度的来源,并对各分量引入的不确定度进行计算,最终得到扩展不确定度。评定结果表明,不确定度的主要来源为重复性测定和工作曲线。扩展不确定度为0.002%,测定的钼矿石中铜的质量分数为(0.047±0.002)%。

This paper measures the copper content in molybdenum ores according to GB/T 14352.3-2010 "Chemical analysis of tungsten and molybdenum ores Part 3:Determination of copper content". The source of the main uncertainty in the test is analyzed, and the uncertainty introduced by each component are evaluated. Finally, the extended uncertainty is obtained. The results show that the repeatability and calibration curve are main uncertainty sources. And the calculated expanded uncertainty was 0.002 %. The measured copper content was 0.047±0.002 %.