Voltammetric determination of traces of cobalt(II) with a chemically modified carbon paste electrode |
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Authors: | Zhiqiang Gao Peibiao Li Zaofan Zhao |
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Affiliation: | (1) Department of Chemistry, Wuhan University, 430072 Wuhan, Hubei, People's Republic of China |
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Abstract: | Summary A new preconcentration and voltammetric determination method for cobalt(II) in aqueous solution with a chemically modified electrode is proposed. The accumulation behaviour and voltammetry of cobalt(II) has been investigated with a carbon paste electrode modified with cationexchanger and 1,10-phenanthroline. The electrochemical response is characterized with respect to carbon paste composition, pH, preconcentration time, cobalt(II) concentration and other variables. For a 3-min preconcentration time, the electrode gives good linearity for 1×10–7 to 4×10–6 mol/l Co(II), a detection limit of 8×10–8 mol/l. The response can be reproduced with a 4.0% relative standard deviation. The method is fairly free from many coexisting ions interferences. A rapid and convenient renewal procedure allows the use of a single electrode in multiple analytical determinations over several days. Satisfactory results are obtained for the determination of cobalt in a variety of certified standard reference materials. |
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