Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 262, Issue 2, Pages 455-459Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1023/B:JRNC.0000046777.74156.6f
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Solvent extraction of tetravalent thorium and trivalent europium ions from nitrate media into dichloromethane solution of triphenylphosphine oxide (TPPO) has been studied. The extractant was shown to be more efficient for europium than for thorium. A conventional log-log analysis reveals that the extraction of both metal nitrates takes place via the formation of the species with 1 : 2 metal to ligand ratio. Thermodynamic parameters i.e., DeltaGdegrees, DeltaHdegrees and DeltaSdegrees of the extraction process using 1,2-dichloroethane as diluent have been calculated based on the influence of the temperature on extraction equilibria in the range 293-313 K. While the extraction of europium is controlled by enthalpy changes, the extraction of thorium is an endothermic process and is driven by entropy changes. A comparison of these data with those obtained for the extraction of europium and thorium nitrates by two other related phosphorylated ligands, tri-n-octylphosphine oxide (TOPO) and diphenyl-NN-dimethylcarbamoylmethylphosphine oxide (DPhiDMCMPO), indicates that DPhiDMCMPO coordinates presumably as a chelating ligand.
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