Abstract
Gold(III) can be preconcentrated from acidic solution on a carbon paste electrode chemically modified with thiobenzanilide under open-circuit conditions. Using cathodic differential pulse voltammetry, 0.05–6 µg ml–1 of gold can be determined after preconcentration for 1 or 2 min. Except for mercury(II) and platinum group metals, common ions have little effect on the determination of gold(III). The preparation and regeneration of the modified electrode as well as the various methodical parameters for the preconcentration and measurement of gold(III) were investigated.
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