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Kinetics of the reduction of Mn2+ at the dropping mercury electrode

✍ Scribed by J.N. Gaur; N.K. Goswami

Publisher: Elsevier Science
Year: 1967
Tongue: English
Weight: 404 KB
Volume: 12
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(67)80063-x

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✦ Synopsis

Theoretical treatments for the kinetic parameters KS and a have been given by Delahay, Koutecky, Randles, Matsuda and Gellings. The analysis of irreversible polarographic waves a8 proposed by Matsuda and Gellings merits further discussion and application for calculating the kinetic parameters for a quasi-reversible reduction. The reduction of Mn*+ at the dropping mercury electrode has been studied in perchlorate, chloride, bromide, iodide and mixtures of perchlorate and halides as supporting electrolytes.

Both Matsuda's and Gelling's methods have been applied to obtain the kinetic parameters of the electrode reactions at 30 and 40°C. The standard rate constant KS is of the order of lo-' cm/s, showing a quasi-reversible reduction.

The effect of temperature and halide ions has been investigated. The reversibility of the reduction decreases in the order I-> Br-> Cl-> ClO,-. A mechanism of the reduction is proposed.

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