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Determination of cobalt(II) by controlled potential coulometry

M. Čakrt, J. Berčík, and Z. Hladký

Department of Analytical Chemistry, Slovak Technical University, 880 37 Bratislava

 

Abstract:  The determination of Co(II) in the presence of Fe(II), Ni(II), Mn(II), Cr(III), and Zn(II) by controlled potential coulometry is described. The method is based on the oxidation of tris(l,10-phenanthroline) cobalt(II) complex at +0.40 - + 0.50 V vs. saturated silver chloride electrode at platinum and glassy carbon electrodes in a supporting electrolyte containing an excess of the complexing agent at pH 3.0 — 4.8. Fe(III) causes interference. The determination of the quantity of electricity passed using the log i vs. t plots eliminates the need foi an integrator. The estimate standard deviation for the determination of 2.0 X 10-8 g-ion Co(II) is 1.6%.

Full paper in Portable Document Format: 274a446.pdf

 

Chemical Papers 27 (4) 446–450 (1973)

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