Voltammetric Measurement of [Cu(II)]/[Cu(I)] at a Platinum Rotating Disc Electrode and Control by Electrolysis at a Platinum Net Electrode in Chloride Solutions

A method has been described to measure and control the [Cu(II)]/[Cu(I)] bulk concentration ratio in aqueous chloride solutions. A variation of the ratio is achieved by controlled potential electrolysis at appropriate reducing or oxidizing potentials. The concentration ratio can be monitored by a rep...

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Bibliographic Details
Published in:Analytical letters 2000-01, Vol.33 (11), p.2243-2258
Main Authors: Westbroek, P., Twagiramungu, F., Strycker, J. De, Vanmoortel, I., Temmerman, E.
Format: Article
Language:English
Subjects:
Chemistry
copper oxidation
copper reduction
Electrochemistry
electrolysis
Exact sciences and technology
General and physical chemistry
Kinetics and mechanism of reactions
voltammetry
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Summary:A method has been described to measure and control the [Cu(II)]/[Cu(I)] bulk concentration ratio in aqueous chloride solutions. A variation of the ratio is achieved by controlled potential electrolysis at appropriate reducing or oxidizing potentials. The concentration ratio can be monitored by a repetitive double potential step amperometric method at a platinum rotating disc electrode. The amperometric signal can be used to control the electrolytic process in order to obtain and maintain a predetermined bulk concentration ratio. Diffusion coefficients of respectively 6.2 10 −6 and 5.6 10 −6 cm 2 s −1 have been determined for Cu(II) and Cu(I). Potential applications of the method are the control of polymerisation reactions, of the reduction of textile dyes with the aid of a mediator system and of the colour characteristics of different kinds of glass.
ISSN:0003-2719
1532-236X
DOI:10.1080/00032710008543186