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Synergistic extraction of Nd(III), Tb(III) and Lu(III) ions with a mixture of picrolonic acid and benzo-15-crown-5 in chloroform
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Habib-ur Rehmann
Published/Copyright:
September 25, 2009
Summary
The synergistic mixture comprising picrolonic acid (HPA) and benzo-15-crown-5 (B15C5) in chloroform has been used for the extraction of Nd3+, Tb3+ and Lu3+ 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 (pKa) 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 Cu2+, Fe3+, Zn2+ and Ni2+ among the cations have some deleterious effect. The extraction equilibrium constants have been evaluated and discussed.
Received: 2005-10-27
Accepted: 2006-4-3
Published Online: 2009-9-25
Published in Print: 2006-8-1
© Oldenbourg Wissenschaftsverlag
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