Synergic extraction of Pr(III), Ho(III) and Er(III) with a mixture of 2-thenoylltrifluoroacetone and tribenzylamine

Abstract

Synergic solvent extraction of Pr(III), Ho(III) and Er(III) was carried out at pH≤3.5 with a mixture of 2-thenoyltrifluoroacetone (HTTA) and tribenzylamine (TBA) from perchlorate media, having ionic strength 0.1M(H+, ClO 4 − ). The stoichiometmric composition of all three synergic adducts was established to be Pr(TTA)3·3TBA, Ho(TTA)3·3TBA and Er(TTA)3·3TBA. The formation constants KTTA and Ksyn and stability constant ±syn were also computed and found to be in the order Er≥Ho>Pr. The effect of various anions on the extraction has also been studied.