Abstract
A sensitive and selective kinetic method for the determination of copper is proposed. It is based on the catalytic effect of copper on the reaction between hexachloroantimonate(V) and hydroxylamine at pH 4.4 (acetic-acetate buffer). The rate of the reaction is potentiometrically monitored with a new antimony(V) ion-selective electrode using 1,2,4,6-tetraphenyl-pyridinium hexachloroantimonate(V) as electroactive material in a poly-(vinyl chloride) membrane. The proposed method allows the determination of copper(II) concentrations in the 5–510 ng ml−1 range, with a variation coefficient of 3.5%. The method has satisfactorily been applied to a variety of real samples.
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