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Citation: Liu Yanmin, Wang Erkang. ELECTROREDUCTION OF ERIOCHROME BLUE BLACK B[J]. Chinese Journal of Applied Chemistry, ;1984, 1(1): 36-41. shu

ELECTROREDUCTION OF ERIOCHROME BLUE BLACK B

Liu Yanmin ¹ ,
Wang Erkang ²

1.
1. Department of Chemistry, Shanxi University;
2.
2. Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 13 August 1983

Electroreduction of eriochrome blue black B was studied by d.c. pola-rography, differential pulse polarography and cyclic voltammetry. Only a single wave which was diffusion-controlled and totally irreversible appeared over the range of pH2-12. With increasing pH, the electron number(according to logarithmic analysis) of the electrode reaction was changed from 2 to 4 around pH6, and the E_1/2 shifted linearly toward more nega-tive potential with a slope of-65mV/pH. Based on the experimental results, a mechanism involving the disproportionation of an unstable inter-mediate was proposed for the reducton of eriochrome blue black B, and by this, the change of electron number with pH was explained.
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