Flow potentiometric and constant-current stripping analysis for silver(I) with carbon- and platinum-fibre electrodes |
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Authors: | Huang Huiliang Daniel Jagner Lars Renman |
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Institution: | Department of Technical Analytical Chemistry, Chemical Center, University of Lund, P.O. Box 124, S-221 00 Lund Sweden |
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Abstract: | At concentrations above 50 μg l?1, silver(I) is determined in nitric acid medium by means of potentiostatic deposition onto a platinum-fibre electrode and subsequent constant-current stripping in the sample or potentiometric stripping in a potassium permanganate medium. Interference from copper(II) is reduced by a pulsed potential procedure whereby copper deposited onto the fibre electrode is reoxidized intermittently. At concentrations below 50 μg l?1, silver(I) is determined by using a mercury-coated carbon-fibre electrode and constant-current stripping in acetonitrile containing 0.20 M perchloric acid. Potentiostatic deposition for 30 min yielded a detection limit of 0.24 μg l?1 silver(I) at the 3σ level. |
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