Abstract
Gold(III) has a strong catalytic effect on the slow redox reaction between Ce(IV) and Hg(I) in a sulphuric acid medium at 90°C, and the Ce(IV) unreacted in the catalytic reaction reacts with benzilic acid to form benzophenone that exhibits a sensitive linear scan voltammetric wave at −0.78 V vs. SCE. This provides the basis for a novel and highly sensitive and selective catalytic method with linear scan voltammetry at a DME for gold. Both reactions of Ce(IV)Hg(I)Au(III) and Ce(IV)—benzilic acid are investigated by means of linear scan voltammetry. The detection limit is 0.05 ng/ml with a fixed-reaction time of 15 min. A linear calibration graph from 0.15 to 5 ng/ml is obtained. Possible influences by co-existing ions are examined. Gold in ore samples is analysed by this catalytic method with satisfactory results.
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