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

Abstract

A very sensitive polarog. catalytic wave is obtained in the cobalt(II) - dimethylglyoxime (DMG) - NO2- - NH4Cl - NH3 (pH 8) system. The adsorption voltammetric limit of detection of cobalt is 1 ?10-11 mol dm-3. It is shown that (NH4)2[Co(DMG)2(NO2)2] adsorbed on the hanging mercury electrode is a highly active mixed-ligand complex. During the irreversible reduction of this complex not only Co(II) and DMG are reduced, but also NO2- is catalytically reduced. "Active cobalt" or its complex, which is formed at the electrode surface, plays an important part in this polarog. catalytic wave.

Key words: ULTRAVIOLET SPECTROPHOTOMETRY, VOLTAMMETRY, POLAROGRAPHIC ANALYSIS, OXIME, BUTANEDIONE P, COBALT COMPLEX, ELECTROCHEMICAL ANALYSIS, CATALYTIC WAVE, NITRITE, NSFC

CLC Number:

O651

Cite this article

NI YAMING;LI LING;GAO XIAOXIA. Study on the polarographic catalytic wave of the cobalt(II)-dimethylglyoxime-nitrite system[J]. Acta Chimica Sinica, 1988, 46(7): 651-656.

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