The amperometric titration of submillinormal concentrations of copper(II) with mercury(I) perchlorate

Abstract

Although quite precise under rigidly controlled conditions, the mercury(I) amperometric titration, at a rotating platinum electrode, of submillinormal concentrations of copper(II) in potassium thiocyanate-perchloric acid medium gives results that vary with the concentrations of thiocyanate and of copper(II). When this variation is eliminated by the addition of potassium iodide, the titration of 10^–5N to 10^–4N copper(II) is precise and accurate to within ±1·5 per cent. The titration of 10^–6N copper(II) is precise to about 5 per cent.