火焰原子吸收光谱法测定铜精矿中银含量的测量不确定度评定

Uncertainty Evaluation on Measurement Results for the Determination of Silver in Copper Concentrates by Flame Atomic Absorption Spectrometry

采用《测量不确定度评定与表示指南》,以火焰原子吸收光谱法测定铜精矿中的银含量为例,对测量结果进行不确定度评定。分析了不确定度的重要来源,包括称样质量、标准工作溶液、工作曲线拟合、试液定容体积及测量重复性等引入的不确定度分量组成。对各不确定度分量进行分析计算,求得标准不确定度为1.56,扩展不确定度为3.12。

Based on 〈 The Guidebook of Uncertainty Evaluation and Denotation of the Measurement Results 〉, the measurement data of silver in copper concentrates by flame atomic absorption spectrometry were collected and the measurement uncertainty was evaluated. The results show that the main sources of the total uncertainty consist of partial uncertainties which come from weighing mass of the sample, calibration solution of silver, fitting of the calibration curves, volume of the sample solution, reproducibility of the measurements and etc.. Each partial uncertainty of measurement was analyzed and calculated and the standard uncertainty of 1.56 and the expanded uncertainty of 3.12 were obtained.