ELECTROCHEMICAL STUDIES ON THE BLEACHING PROCESS Ⅱ.THE EFFECT OF IODIDE ON THE OXIDATION OF METALLIC SILVER WITH Fe(Ⅲ)-COMPLEXES

doi:10.7517/j.issn.1674-0475.1992.04.289

Imaging Science and Photochemistry ›› 1992, Vol. 10 ›› Issue (4): 289-296.DOI: 10.7517/j.issn.1674-0475.1992.04.289

ELECTROCHEMICAL STUDIES ON THE BLEACHING PROCESS Ⅱ.THE EFFECT OF IODIDE ON THE OXIDATION OF METALLIC SILVER WITH Fe(Ⅲ)-COMPLEXES

LIU CHUN-YAN¹, ULRICH NICKEL²

1. Institute of Photographic Chemistry, Academia Sinica Beijing, 100101, P. R. China;
2. Institute für Physikalische and Theoretische Chemie der University Erlangen-Nürnberg, Germany

Received:1991-02-23 Revised:1992-03-02 Online:1992-11-20 Published:1992-11-20

Abstract

Abstract: In this paper, it was found that, when bromide is present in the solution of Fe(Ⅲ)-com-plexes, it makes a slower redox reaction between Fe(Ⅲ)-complexes and metallic silver.If iodide is present instead, the same reaction will be accelerated.The additivity principle for electric current and the solubility product of AgX may account for the acceleration effect of iodide.However, Agl is more difficult to remove completely from the electrode surface than AgBr.When both bromide and iodide are present, the formation rate of AgX on the electrode surface first decreases and then increases with increasing iodide concentration.Due to the lower solubility product of Agl and more negative mixed potential between Fe(Ⅲ)-complex/Fe(Ⅱ)-complex and Ag/AgI, Agl is formed preferably on the surface of the electrode, when it was dipped into the bromide solution containing little iodide.

Key words: galvanostat, bleaching process, silver halide

LIU CHUN-YAN, ULRICH NICKEL. ELECTROCHEMICAL STUDIES ON THE BLEACHING PROCESS Ⅱ.THE EFFECT OF IODIDE ON THE OXIDATION OF METALLIC SILVER WITH Fe(Ⅲ)-COMPLEXES[J]. Imaging Science and Photochemistry, 1992, 10(4): 289-296.

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ELECTROCHEMICAL STUDIES ON THE BLEACHING PROCESS Ⅱ.THE EFFECT OF IODIDE ON THE OXIDATION OF METALLIC SILVER WITH Fe(Ⅲ)-COMPLEXES

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