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Apr 24, 2017
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Jun 1, 2003
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Abstract

Solvent extraction of Thorium (VI) ion from perchlorate solution using didodecylphosphoric acid, DDPA, in chloroform diluent was studied. The effects of stripping hydrochloric acid concentration, stripping time, extraction time, DDPA concentration, pH, ionic strength, supporting electrolyte and temperature on the extraction processes have been studied. From the distribution coefficient values at different temperatures,the enthalpy, the free energy and the entropy changes associated with the extraction processes were determined. The composition of the complex formed was established to be Th(ClO4)4-nRn(HR)5-n where, n=1 or 2 and (HR)2 represents the dimer of DDPA.

 

 

Keywords

Thorium(IV) Solvent extraction DDPA Thermodynamics.

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References

  1. BAES, C.F. Jr. 1962. The Extraction of Metallic Species by Dialkylphosphoric Acids. J. Inorg. Nucl. Chem. 24: 707-720.
  2. BAES, C.F. Jr., ZINGARO, R.A and COLEMAN, C.F. 1958. . The Extraction of Uranium(VI) from Acid Perchlorate Solutions by Bis(2-ethylhexyl)phosphoric Acid in Hexane. J. Phys. Chem. 62: 129-136.
  3. BUNUS, F.T., DOMOCOS, V.C and DUMITRESCU, P. 1978. Synergic Extraction of Uranium from Phosphate Solutions with Di-(2-ethylhexyl)phosphoric Acid and Tri-n-octylphosphine Oxide. J. Inorg. Nucl. Chem. 40: 117-121.
  4. DEAN, J.A. 1969.Chemical Separation Methods, pp. 18-44. Van Nostrand Reinhold, New York.
  5. KHALED, M.M and KHALILI, F.I. 1999. Solvent Extraction of Uranium(VI) by Didodecylphosphoric Acid. Science and Technology. 4:15-21.
  6. KIWAN, A.M and AMIN, R.S. 1973. Extraction of Uranium(VI) by Di-(2-ethylhexyl)phosphoric Acid from Perchloric Acid Solutions. J. Inorg Nucl. Chem. 35: 3315-3321.
  7. KOLARIK, Z. 1982. Gmelin Handbook of Inorganic Chemistry. Vol. D2, 8th. Edition, p. 34. Springer-Verlag, Berlin.
  8. KONDO K, MOMOTA, K. and NAKASHIO, T. 1989. Equilibrium of Solvent Extraction of Lanthanides with Didodecylphosphoric Acid. Solvent Ext. Ion Exch. 7: 1027-1041.
  9. LUGININ, V.A and TSERKOVIINTSKAYA, I.A. 1976. Mechanism of the Extraction of Uranium(VI) by Di-(2-ethylhexyl)phosphoric Acid from Mineral Acid Solutions. Porb. Soverm. Anal. Khim. 1: 148-155.
  10. MARCUS, Y., and KOLARIK, Z. 1976. Thermodynamics of Liquid-Liquid Distribution Reactions-III. J Inorg Nucl Chem. 38: 1069-1073.
  11. MASON, G.W., GRIFFIN, H.E and LEWEY, S.M. 1981. J. Inorg. Nucl. Chem. 43: 391-395.
  12. MASON, G.W., SCHOFER, N.L and PEPPARD, D.F. 1970. The Extraction of U(VI) and Selected M(III) Cations by Bis Neo-octylphosphoric Acid in Two Different Hydrocarbon Diluents. J. Inorg Nucl Chem. 32: 3911-3922.
  13. PEPPARD, D.F., MASON, G.W. DRISCOLL, W.J and MCCARTY, S. 1959. Extraction of Thorium(IV) by Di Esters of Orthophosphoric Acid. J. Inorg. Nucl. Chem. 13: 138-150.
  14. PEPPARD, D.F., MASON, G.W. MAIEER, J.L and DRISCOLL, W.J. 1957. Fractional Extraction of the Lanthanides as their Di-alkylorthophosphates. J. Inorg. Nucl. Chem. 4: 334-343.
  15. ROZEN, A.M., MARTYNOV, B.V. ANIKIN, V.I and MAMAEV, L.A. 1973. Extraction Capability of Sulfoxides. Soviet Radiochem. 15: 121-123.
  16. SATO, T. 1965. The Extraction of Uranium(VI) from Hydrochloric Acid Solutions by Di-(2-ethylhexyl)phosphoric Acid. J. Inorg. Nucl. Chem. 27: 1853-1860.
  17. SATO, T. 1967. The Extraction of Thorium from Nitric Acid Solutions by Di-(2- ethylhexyl)phosphoric Acid. J. Inorg Nucl. Chem. 29: 555-563.
  18. SAVVIN, S.B. 1961. Analytical Use of Arsenazo(III). Talanta. 8: 673-685.