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On the adsorption voltammetry of the boron‐Beryllon III system: Part II. Mechanism of the electrochemical reduction of Beryllon III and its complex with B(III) in acetate buffer
Author(s) -
Jin Wenrui,
Jiao Kui,
Metzner H.
Publication year - 1993
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140050512
Subject(s) - polarography , chemistry , dropping mercury electrode , adsorption , electrochemistry , electron transfer , voltammetry , hanging mercury drop electrode , electrode , cyclic voltammetry , buffer solution , inorganic chemistry , linear sweep voltammetry , reaction mechanism , analytical chemistry (journal) , catalysis , organic chemistry
The adsorptive and voltammetric characteristics of Beryllon III and its complex with B(III) at a mercury electrode have been investigated in acetate buffer. The adsorption phenomena were observed by sampled dc polarography, normal pulse polarography, linear sweep voltammetry, and drop time curve measurement. It was found that (1) the reactant was an azo‐group in Beryllon III or its complex with B(III) adsorbed on the surface of the mercury electrode; (2) for reduction of Beryllon III, the product was a hydrazo compound and it was also adsorbed on the surface of the electrode; two electrons and two protons were irreversibly transferred in the overall reaction and the apparent transfer coefficient α n (= 1.8) was measured experimentally; the irreversible electron transfer was followed by a chemical reaction; (3) for reduction of Beryllon III complex with B(III), the product was a hydrazo compound; two electrons and two protons were transferred reversibly in the reaction; the hydrazo compound was desorbed from the surface of the electrode, and the reversible electron transfer was followed by a chemical reaction.