China Nonferrous Metallurgy

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.