碘量法测定阳极铜中铜含量的不确定度评定

本文对碘量法测定阳极铜中铜含量进行了不确定度评定,分析了该方法测定过程中的不确定度来源,包括称样质量、标准溶液的配制、标准滴定液的标定和样品滴定等。通过建立数学模型对各不确定度分量进行了计算,然后按方根和得到的不确定度评定结果,合成标准不确定度为0.20%,扩展不确定度为0.40%。该实验及结果表明,碘量法测定阳极铜中铜含量与实际标准含量的差异,主要来源于标准滴定液的标定和样品滴定,可通过控制标准滴定液的标定和样品滴定的规范性,来保证测量结果的准确性和可靠性。

Evaluation of uncertainty in the determination of copper content in anode copper by iodometry method

In this paper,the uncertainty of the determination of copper content in anode copper by iodometry method is evaluated,and the sources of uncertainty in the determination process are analyzed,including sample quality,standard solution preparation,standard titration solution calibration and sample titration,etc.Through the establishment of a mathematical model,the uncertainty components are calculated,and then the uncertainty evaluation results are obtained according to the square root sum.The combined standard uncertainty is 0.20%and the expanded uncertainty is 0.40%.The experiment and results show that the difference between the copper content in anode copper determined by the iodometric method and the actual standard content is mainly derived from the calibration of the standard titrant and the sample titration,which can be controlled by the standardization of the standard titrant and the standardization of the sample titration to ensure the accuracy and reliability of the measurement results.