Electrochemical detection of silver ions in nickel chloride based process solutions

Silver ions are present as impurities in the electrolyte used for nickel electrowinning. A method for monitoring the silver concentration in process solutions is needed to ensure that silver ions have been removed to a sufficient degree before electrowinning. Electrochemical measurements can be used for online monitoring, and the silver ion concentration may be recorded several times each hour. The aim of this thesis was to develop an electrochemical method for detecting silver ions in actual nickel process solutions with a high chloride content. (...)