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Journal of Solution Chemistry

, Volume 39, Issue 6, pp 747–769 | Cite as

Evidence of Different Stoichiometries for the Limiting Carbonate Complexes across the Lanthanide(III) Series

  • V. PhilippiniEmail author
  • T. Vercouter
  • P. Vitorge
Article

Abstract

The stoichiometries of limiting carbonate complexes of lanthanide(III) ions were investigated by solubility measurements of hydrated NaLn(CO3)2 solid compounds (Ln = La, Nd, Eu and Dy) at room temperature in aqueous solutions of high ionic strength (3.5 mol⋅kg−1 NaClO4) and high \(\mathrm{CO_{3}^{2-}}\) concentrations (0.1 to 1.5 mol⋅kg−1). The results were interpreted by considering the stability of carbonate complexes, with limiting species found to be \(\mathrm{La(CO_{3})_{4}^{5-}}\), \(\mathrm{Nd(CO_{3})_{4}^{5-}}\), \(\mathrm{Eu(CO_{3})_{3}^{3-}}\) and \(\mathrm{Dy(CO_{3})_{3}^{3-}}\). TRLFS measurements on the Eu and Dy solutions confirmed the predominance of a single aqueous complex in all the samples. Equilibrium constants were determined for the reaction \(\mathrm{Ln(CO_{3})_{3}^{3-}}+\mathrm{CO_{3}^{2-}}\)\(\mathrm{Ln(CO_{3})_{4}^{5-}}\): \(\log_{10}K\mathrm{^{3.5m\:NaClO_{4}}_{4,La}=0.7\pm0.3}\), \(\log_{10}K\mathrm{^{3.5m\:NaClO_{4}}_{4,Nd}=1.3\pm0.3}\), and for Ln = Eu and Dy, \(\log_{10}K\mathrm{^{3.5m\:NaClO_{4}}_{4,Ln}\leq-0.4}\). These results suggest that tetracarbonato complexes are stable only for the light lanthanide ions in up to 1.5 molal \(\mathrm{CO_{3}^{2-}}\) aqueous solutions, in agreement with our recent capillary electrophoresis study. Comparison with literature results indicates that analogies between actinide(III) and lanthanide(III) ions of similar ionic radii do not hold in concentrated carbonate solutions. \(\mathrm{Am(CO_{3})_{3}^{3-}}\) was previously evidenced by solubility measurements, whereas we have observed that \(\mathrm{Nd(CO_{3})_{4}^{5-}}\) predominates in similar conditions. We may speculate that small chemical differences between Ln(III) and An(III) could result in macroscopic differences when their coordination sphere is complete.

Keywords

Complex Carbonate Lanthanides Solubility TRLFS SIT 

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Authors and Affiliations

  1. 1.CEA Saclay DEN/DPC/SECR Laboratoire de spéciation des radionucléides et des moléculesGif-sur-YvetteFrance
  2. 2.Laboratoire Analyse et Modélisation pour la Biologie et l’Environnement UMR 8587, Bâtiment MaupertuisUniversité d’Evry Val d’Essonne—CNRSEvry cedexFrance
  3. 3.Laboratoire de Radiochimie, Sciences Analytiques et Environnement (LRSAE), Institut de Chimie de Nice (ICN)Université de Nice Sophia-AntipolisNice Cedex 2France

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