Abstract
INVESTIGATIONS into the use of alkyl phosphoric acids as metal extractants have shown that there are relatively large differences between the stabilities of the complexes of individual rare earths with di-(2-ethylhexyl) orthophosphoric acid (HDEHP), the separation factor for any adjacent pair being about 2.51. This figure suggests that it should be feasible to devise a comparatively simple scheme for rare earth separations based on a multi-stage extraction procedure utilizing HDEHP as extractant. If the organic reagent can be immobilized on a solid phase the effect of a number of successive extractions may be achieved by eluting the metals chromatographically from a column of the extractant, and it has already been shown that complexing agents may be incorporated into solid supports to provide column materials of this type2–6. Investigations into the behaviour of a number of support materials retaining HDEHP have indicated that a poly-(vinyl chloride/vinyl acetate) copolymer (‘Corvic’, Imperial Chemical Industries, Ltd.) will hold the complexing agent firmly and will give elution curves with the rare earths which show relatively little tailing. Using columns packed with ‘Corvic’ retaining HDEHP it has been found possible to separate small quantities of the elements lanthanum–cerium–praseodymium–neodymium–promethium–samarium–europium and gadolinium, using normal chromatographic techniques.
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PIERCE, T., PECK, P. Use of Di-(2-ethylhexyl) Orthophosphoric Acid for the Separation of the Elements Lanthanum–Gadolinium by Reverse Phase Partition Chromatography. Nature 194, 84 (1962). https://doi.org/10.1038/194084a0
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DOI: https://doi.org/10.1038/194084a0
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