The method is applicable to the determination of copper contents greater than or equal to 99.90%. Silver, when present, is deposited with copper and valued as copper. The copper must not contain elements that give an insoluble residue in the solution to be electrolyzed nor elements in such a content that they can deposit with the copper.
UNI 6624-1969 history
1969UNI 6624-1969 Chemical analysis of iron-free metallic minerals. Determination of copper content in copper, partially replacing UNI 3357. electrolysis