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Interaction effect between thenoyltrifluoroacetone and tri-n-octylphoshine oxide in the synergistic extraction of trivalent lanthanides. Determination of the composition of the extracted species+ of the extracted species

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Abstract

The distribution constant KD(HTTA) of thenoyltrifluoroacetone between 10−3M HNO3 and cyclohexane was determined by means of spectrophotometric measurements of HTTA concentration in the aqueous phase. The distribution ratio, D′, of HTTA, when tri-n-octylphosphine (TOPO) is present, and the equilibrium constant,β ′n , of the reaction between HTTA and TOPO in the organic phase were also determined. By means of the known KD(HTTA) and D′ values, the equilibrium constant of the HTTA-TOPO interaction was calculated. Making use of KD(HTTA) andβ ′n values and of the slope analysis method, the composition of the extracted lanthanide complexes was established. By considering the interaction reaction between the extractants, the species Ln(TTA)3 · TOPO and Ln(TTA)3 · 2(TOPO), for Ln=La and Yb, were identified in the organic phase. The equilibrium constants of the reactions that give rise to the species were also calculated.

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Authors and Affiliations

  1. Radiochemistry Division, Instituto de Pesquisas Energeticas e Nucleares Comissão Nacional de Energia Nuclear, Pinheiros, Caixa Postal 11049, 01000, São Paulo, SP, Brasil

    D. I. T. Fávaro

  2. Chemical Engineering Department, Instituto de Pesquisas Energeticas e Nucleares Comissão Nacional de Energia Nuclear, Pinheiros, Caixa Postal 11049, 01000, São Paulo, SP, Brasil

    L. T. Atalla

Authors
  1. D. I. T. Fávaro
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  2. L. T. Atalla
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From a thesis submitted by D. I. T. FÁVARO to the University of São Paulo in partial fulfillment for a Doctor of Sciences Degree in Nuclear Technology.

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Fávaro, D.I.T., Atalla, L.T. Interaction effect between thenoyltrifluoroacetone and tri-n-octylphoshine oxide in the synergistic extraction of trivalent lanthanides. Determination of the composition of the extracted species+ of the extracted species. Journal of Radioanalytical and Nuclear Chemistry, Articles 111, 81–94 (1987). https://doi.org/10.1007/BF02060523

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  • DOI: https://doi.org/10.1007/BF02060523

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