Simultaneous amperometric determination of nickel and copper

A method is described for the amperometric titration of nickel and successive amperometric determination of copper and nickel. Nickel (1.0-16.0 mg) and copper (1.0-11.0 mg) could be determined with an average error of less than 1%. Cobalt interferes but chloride does not. Interference by aluminium, iron(III) and chromium can be eliminated. Zinc and manganese do not interfere if the correct applied voltage is chosen. The procedures can be utilized in the analysis of alloys such as nichrome, Raney nickel, constantan, german silver and manganin. It is best to use the standard addition method for less than 3 mg of nickel.