HIGH-SPEED COUNTERCURRENT CHROMATOGRAPHY USING A SMALL COILED COLUMN

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Abstract
Separation of selected lanthanoid elements was performed by high-speed countercurrent chromatography (CCC) equipped with a small coiled column of a 10 cm3 capacity. A hexane solution of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (EHPA) was retained in the tubing column as the stationary phase. The stationary phase retention increased with increasing rotational speed and with decreasing flow rate of the aqueous mobile phase. Mixtures of lanthanoids (Gd, Tb and Dy) were chromatographically eluted in the increasing order of extractability by introducing the buffered mobile phase, and excellent separation of lanthanoids was achieved. Lanthanoids (Sm through Er) and yttrium were simultaneously enriched in the stationary phase from a large volume of a sample solution, and then separated from each other with reasonable resolution.