Abstract
A mechanism is proposed for the electrochemical reduction of tetrazolium blue (TB2+ ) on the surface of a dropping mercury electrode. The reaction was performed in a heterogeneous solvent: non-ionic micelles of Triton X-100, in an aqueous buffer solution, at pH 7.0. The mechanism, deduced from polarographic data, was found to consist of: (i) two irreversible diffusion-controlled processes, each one with two electrons transferred; and (ii) at least two more electron-transfer paths in which one or both of the oxidized and reduced species are adsorbed on the electrode. The oxidation-reduction potentials obtained for the two redox pairs involved (TB2+/TBH+ and TBH+/TBH2) are −0.134 and −0.709 V, respectively, versus a standard hydrogen electrode.
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