Journal of Radioanalytical and Nuclear Chemistry

, Volume 211, Issue 2, pp 305–316 | Cite as

The separation of zinc(II) and cadmium(II) by liquid-liquid extraction

  • M. L. P. Reddy
  • G. P. Preetha
  • C. V. Meena
  • T. Prasada Rao
  • C. S. P. Iyer
  • A. D. Damodaran
Article
Received:

Abstract

The extraction of Zn(II) and Cd(II) from thiocyanate solutions with bis-2-ethylhexyl sulphoxide (B2EHSO) in benzene as an extractant has been studied by tracer techniques. For comparison, extraction has also been carried out with tributylphosphate (TBP). The extraction data have been analysed by both graphical and theoretical methods by taking into account complexation of the metal in the aqueous phase by inorganic ligands and plausible complexes extracted into the organic phase. The results demonstrate that Zn(II) is extracted as Zn(SCN)2·2B2EHSO and Zn(SCN)2·2TBP. In the case of Cd(II), the extracted species are Cd(SCN)2·4B2EHSO/4TBP. The synergistic extraction of Zn(II) and Cd(II) with mixtures of 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 (HPMBP) and B2EHSO or TBP or trioctylphosphine oxide (TOPO) from acetate buffer solutions has also been investigated. Zn(II) is extracted as Zn(PMBP)2·B2EHSO/TBP/TOPO. On the other hand, Cd(II) is found to be not extracted with these mixed-ligand systems under the experimental conditions. These results also demonstrate the mutual separation of Zn(II) and Cd(II) using the synergistic extraction with HPMBP in the presence of various neutral oxodonors.

Keywords

Topo Thiocyanate Sulphoxide Acetate Buffer Solution Tracer Technique 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Akadémiai Kiadó 1996

Authors and Affiliations

  • M. L. P. Reddy
    • 1
  • G. P. Preetha
    • 1
  • C. V. Meena
    • 1
  • T. Prasada Rao
    • 1
  • C. S. P. Iyer
    • 1
  • A. D. Damodaran
    • 1
  1. 1.Regional Research Laboratory (CSIR) TrivandrumIndia

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