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Mechanism of 1-phenylazo-2-naphthol-3,6-disulphonic acid reduction on a mercury electrode

  • F Capitan
  • A Guiraum
  • J L Vilchez
  • J M Bosque
Inorganic And Analytical

Abstract

The reduction of 1-phenylazo-2-naphthol-3,6-disulphonic acid (disodium salt) at the dropping mercury electrode has been investigated. The reduction takes place in a two-electron step. The process is diffusion controlled. The reagent captures two electrons and one or two hydrogen ions depending on whether the pH is higher or lower than 7, producing 1-phenylhydrazo-2-naphthol-3,6-disulphonic acid, in both cases. A disproportionation reaction of the hydrazo compound takes place, and amines are the final reduction products. The reaction orders, together with Tafel’s slopes have been calculated.

Keywords

1-Phenylazo-2-naphthol-3,6-disulphonic acid (disodium salt) polarography cyclic voltammetry azo dyes 

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Copyright information

© Indian Academy of Sciences 1984

Authors and Affiliations

  • F Capitan
    • 1
  • A Guiraum
    • 1
  • J L Vilchez
    • 1
  • J M Bosque
    • 1
  1. 1.Department of Analytical Chemistry, Analytical Section of CSIC, Faculty of SciencesUniversity of GranadaGranadaSpain

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