Studies on the Mechanism of the Polarographic Catalytic Wave of Chromium(Ⅵ) in the Buffer System of (o-Phen)-NaNO2-NH3-NH4Cl

Abstract

Abstract: Anew viewpoint elucidating the mechanism of a highly sensitive polarographic catalytic wave of Cr(Ⅵ) in the medium of 1,10-phenanthroline-nitrite-NH₃-NH₄Cl (pH 9.4) is presented.This wave is not a catalytic hydrogen wave, but a catalytic (EC-EC') reaction in which Cr(Ⅵ) is firstly reduced to Cr(Ⅲ), then it forms a multi-coordination compound A (as electroactive species) in the following chemical reaction.In the second step of the electrode reaction, the ligand NO₂^- in the compound Ais reduced, then the product of Ais oxidized by NO₂^- in solution to regenerate the starting material Aagain.The composition of the multi-coordination compound and the conditional formation constant for various ligands are determined.

Key words: Chromium, Catalytic wave, Conditional formation constant, Multi-complex

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Han Jilin, Chen Hongyuan, Gao Hong. Studies on the Mechanism of the Polarographic Catalytic Wave of Chromium(Ⅵ) in the Buffer System of (o-Phen)-NaNO₂^-NH₃-NH₄Cl[J]. Chem. J. Chinese Universities, 1989, 10(12): 1189.

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Studies on the Mechanism of the Polarographic Catalytic Wave of Chromium(Ⅵ) in the Buffer System of (o-Phen)-NaNO₂^-NH₃-NH₄Cl

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