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Amperometrically indicated "pseudotitrations". 4. Complexometric determination of Cr(III) compounds in low concentrations using deconvolution voltammetry and differential pulse polarography

D. Bustin and M. Rievaj

Department of Analytical Chemistry, Slovak Technical University, CS-81237 Bratislava


Abstract: The Cr(III) compounds can be determined complexometrically by the direct "pseudotitration" in spite of the fact that the complexation reaction with EDTA is very slow and its range in the bulk phase of titrated solution is negligible. In the vicinity of amperometrical indicating electrode, however, the titration reaction takes place sufficiently rapidly due to the effective redox catalysis. Application of deconvolution voltammetry and differential pulse polarography enables to determine Cr(III) in the minimal concentra­tion 5 x 10-6 mol dm-3 Reasons are given which make it impossible to achieve mpre favourable (lower) limit of determination.

Full paper in Portable Document Format: 412a227.pdf


Chemical Papers 41 (2) 227–233 (1987)

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