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Journal of Applied Electrochemistry

, Volume 34, Issue 1, pp 103–109 | Cite as

Back extraction of platinum metals from liquid membranes in an electric field

  • L. KulikovaEmail author
  • O. Petrichenko
  • V. Serga
  • A. Jansone
Article

Abstract

A new method for back extraction of platinum metals from the salts of tertiary amines and quaternary onium bases in the organic phase is proposed. This method allows the back extraction of platinum metals into diluted solutions of mineral acids over one stage. The method involves the passing of direct current through a system in which the extract containing a platinum metal is a liquid membrane. This method allows a practically complete back extraction of the anions PtCl62-, RuNOCl52- and Ru2OCl104- (the latter passes into the aqueous phase without breaking the dimer anion). It was found that when PtCl62-, PdCl42- and Ru2OCl104- are in a liquid membrane based on Oct3NHCl in 1.2-dichloroethane, under the action of an electric field all these anions are transferred into aqueous 1 M HCl (E > 85%). To provide maximum back extraction of platinum metal anions, it is necessary to use small concentrations of extractants in 1.2-dichloroethane (0.1 M for Oct3NHCl and 0.03–0.04 M both for Oct4NCl and Ph4PCl) over the period of the back extraction. Cyclic voltametry has demonstrated the determining role of chloroions in current transport through the interface of phases I and II.

back extraction electric field liquid membranes platinum metals 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • L. Kulikova
    • 1
    Email author
  • O. Petrichenko
    • 1
  • V. Serga
    • 1
  • A. Jansone
    • 1
  1. 1.Institute of Inorganic ChemistryRiga Technical UniversitySalaspils-1Latvia

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