Abstract
ABSTRACT Measurement of the extraction equilibrium of europium by didodecylphosphoric acid dissolved in toluene diluent vas carried out at 303 K. From vapor-phase osmometry, it was found that the extractant (HR) is apt to diaerize in toluene diluent. It vas clarified that the lanthanide ion (Ln3+) is extracted according to the following equation. The extraction equilibrium constant of the metal vas obtained. The extraction equilibria of three lanthanide ions, that is, samarium, europium and gadolinium by the extractant from mixed solution of the metals were also measured. The extraction equilibrium constants of respective metals were obtained. The separation factor between samarium and europium vas found to be improved compared vith the extractions by 2-ethyIhexylphosphonic acid mono-2-ethylhexyl ester and di (2-ethylheiyl)phosphoric acid.
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