Study on the polarographic catalytic wave of the system cobalt(II)-dimethylglyoxime

Abstract

In the Co(II)-dimethylglyoxime (HDMG)-NH3-NH4Cl (pH 9) system, Co(II)(DMG)2 in the solution is adsorbed on the Hg electrode surface and exhibited a highly sensitive polarog. catalytic peak. The characteristics of this catalytic current was investigated by linear potential sweep voltammetry, cyclic voltammetry and stripping anal. The experimental evidences showed that a 0-valence "active cobalt" was formed during the irreversible reduction of Co(II)(DMG)2 and simultaneously DMG is catalytically reduced by the "active cobalt". The mechanism of this system with the conflicting explanations of a catalytic H wave or only an adsorptive complex wave is discussed.

Key words: ANODIC-STRIPPING VOLTAMMETRID METHOD, POLAROGRAPHIC ANALYSIS, COBALT COMPLEX, DIMETHYL GLYOXINE, ELECTROCHEMICAL ANALYSIS, CATALYTIC WAVE, CYCLOVOLTAMGRAPH

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Cite this article

NI YAMING;LI LING;ZHOU CHUN;GAO XIAOXIA. Study on the polarographic catalytic wave of the system cobalt(II)-dimethylglyoxime[J]. Acta Chimica Sinica, 1987, 45(10): 971-976.

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