Abstract
Mutual separation of rare earth elements has been investigated by high-speed countercurrent chromatography equipped with a multilayer coiled column. Rare earth elements were first enriched into the stationary phase comprised of the toluene solution of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester from a large volume of aqueous solution, and then chromatographically eluted by the mobile phase with stepwise pH gradient. Enrichment separation of a series of rare earth elements including yttrium was accomplished with sufficient resolution.
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