Abstract:In this paper, the copper content in copper concentrates is determined by electrogravimetric method. The sample is digested with nitric acid and sulfuric acid. Impurity elements are removed by adding hydrobromic acid. The solution is added with excess ammonia and filtered. The copper-containing filtrate is then electrolyzed and deposited copper weighted. The trace of copper in the residue and residual liquid is determined by inductively coupled plasma atomic emission spectrometry. From the experiment of accuracy, it can be concluded that electrogravimetric method is accurate and reliable. The results of 10 copper concentrate samples are in consistent with those by iodometric method, with deviations all less than 0.15%. In the precision experiment, the RSD results by electrogravimetric method of sample GBW07166 and Cu-10 are 0.20%, 0.19%, respectively, less than 0.34%, 0.28% by iodometric method，indicating a higher precision of electrogravimetric method. Therefore, it is necessary to promote the electrogravimetric method to determine the copper content in copper concentrates area.