Abstract
Thio derivatives of 4-benzoyl 2,4-dihydro 5-methyl 2-phenyl 3H-pyrazol-3-one (SBMPP) and benzoyltrifluoroacetone (SBTA) have been employed as extractants for the extraction of europium (III). Europium (III) was extracted from buffered aqueous media into benzene as Eu (SBMPP)3 and Eu (SBTA)3 chelates. The effect of phosphorus esters, tri-octylphosphine oxide (TOPO) and tributylphosphate (TBP) and hetero cyclic bases, pyridine, γ-picoline and quinoline as auxiliary ligands on the extraction of europium (III) was studied. A large synergistic enhancement was observed in all systems. The values of equilibrium constants (logK es ) and adduct formation constants (logK s ) have been calculated.
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