Analytical chemistry of unusual oxidation states: the polarography of vanadium(IV) in cyanide medium.
The polarographic reduction wave for vanadium(IV) in cyanide medium has been studied and the effect of cyanide concentration on the diffusion current and half-wave potential has been interpreted, using the theory of irreversible but diffusion-controlled reduction. Coulometric experiments suggest a two-electron transfer, and the shift of half-wave potential corresponds to the addition of one cyanide ion during the reduction step. The proportionality of wave-height to vanadium concentration in the used alkaline cyanide medium indicates a possible analytical unity. The half-wave potential is about -1.1 V.
Mendez
J H
JH
Department of Analytical Chemistry, Faculty of Science, Analytical Chemistry Section of the Consejo Superior de Investigaciones Cientificas (C.S.I.C.) Salamanca, Spain.
Misiego
A S
AS
Conde
F L
FL