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The synergistic mixture comprising picrolonic acid (HPA) and benzo-15-crown-5 (B15C5) in chloroform has been used for the extraction of Nd 3+ , Tb 3+  and Lu 3+  as representatives of lanthanide(III) ions from pH 1-2 solutions having ionic strength of 0.1 mol l −1  (K + /H + , Cl − ). The composition of the extracted species has been determined as M(PA) 3 ·nB15C5 where M is Nd, Tb and Lu and  n  = 1 or 2. The acid dissociation constant (p K  a ) has been evaluated to be 2.52 ± 0.01. The influence of various anions and cations on the extraction of these lanthanide(III) ions has also been studied and only oxalate and thiosulphate among the anions and Cu 2+ , Fe 3+ , Zn 2+  and Ni 2+  among the cations have some deleterious effect. The extraction equilibrium constants have been evaluated and discussed.

Synergistic extraction of Nd(III), Tb(III) and Lu(III) ions with a mixture of picrolonic acid and benzo-15-crown-5 in chloroform