The reduction of the complexes of Mn(I1) with formate and sulphate ions is quasireversible. The formation constants of the corn lexes have been determined by the polarographic meth od: of Mn(I1) with sulphate and formate ions The reversible half-wave potentials are calculated from the observed E,,,
Characteristics of the reduction of the Cu-citrate complexes at the HMDE and DME
✍ Scribed by S. González; S.V. Alvarez; A. Arévalo
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 358 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
A study of the electrochemical behaviour of Cu(II) at the hmde and dnw with citric acid as supporting electrolyte at different pHs is presented. The complex Cwcitrate species which originate the voltammetrlc curves are determined and the existence of a binuclear complex accounting for the appearance of a second wave in the voltammograms is confirmed. The nature of the voltammetric maximum, which appears immediately after the current attains the value of i p, is i.nterpreted with regard to inhomogeneous adsorption of thereactant on the surface of the electrode. The mmmmm ofthedc polarograms is attributed to
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The minimum presented by the polarograms of the reduction of Cu(I1) in Li+, Na+ and K+ citrate is analysed in order to determine the charge of the reacting species and the coefficient of transfer, OL, of the process. The results obtained allow the participation of thecomplex anions (Cu,Cit,)'-and (C