Analytical Sciences

Synergic Extraction of Lanthanoids by Mixtures of LIX 54 (High Molecular Weight beta-Diketone) and Bidentate Neutral Amines

Shigeto NAKAMURA,* Shuichi TAKEI,** and Kenichi AKIBA**

*Hachinohe National College of Technology, Tamonoki, Hachinohe 039-1192, Japan
**Institute for Advanced Materials Processing, Tohoku University, Katahira-2, Aoba, Sendai 980-8577, Japan

The synergic extraction of lanthanoids has been investigated using mixtures of high molecular weight beta-diketone, LIX 54 (HA; major component, 1-phenyl-3-isoheptyl-1,3-propanedion) and bidentate neutral ligands (S) in toluene. The distribution behavior of bidentate amines (2,2'-bipyridine (bpy), 1,10-phenanthroline (phen) and 2,9-dimethyl-1,10-phenanthroline (dmp)) was investigated and their related equilibrium constants were evaluated. The synergic effect is produced by the formation of such adduct complexes as MA₃·S. The extraction constants with LIX 54 alone and those in the presence of bidentate ligands were determined for lanthanoid-series elements.

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