Acta Chimica Sinica ›› 1987, Vol. 45 ›› Issue (10): 971-976. Previous Articles     Next Articles

Original Articles

钴(II)-丁二酮肟体系极谱催化波的机理研究

倪亚明;李玲;周纯;高小霞   

  1. 北京大学化学系
  • 发布日期:1987-10-15

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

NI YAMING;LI LING;ZHOU CHUN;GAO XIAOXIA   

  • Published:1987-10-15

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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