Abstract

A new method of determining electrochemical kinetic parameters by square-wave polarography was presented, in which the faradaic current at θ/2, θ being the half-period of superimposed square-wave voltage, was used for the analysis. The method gave the following kinetic parameters for the electrode reaction, Zn(II) + 2 e(Hg), in aqueous solutions at 25° C: k c θ=0.0052 cm s −1 and α c=0.36 in 1 M KCl, k c θ=0.011 cm s −1 and α c=0.30 in 1 M KBr, and k c θ=0.020 cm s −1 and α c=0.52 in 1 M KNCS. Induced adsorption of Zn(II) on the dropping mercury electrode was suggested in solutions containing thiocyanate ions.

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