Abstract
The distribution coefficients on Dowex I-X8 anion-exchange resin were determined for all the rare earths at various proportions of concentrated nitric acid and acetone, using radioactive tracers of the metallic ions. In the range 4–40% nitric acid, the distribution coefficients decrease with increasing content of nitric acid, and at a given ratio of acid to acetone, they decrease with increasing atomic number in the lanthanum series. The value for yttrium is close to that of thulium; scandium is much less adsorbed. Literature data for aqueous systems and other mixed solvent systems are discussed. The distribution of scandium between Dowex I-X8 and conc. nitric acid-methanol, ethanol or acetone systems is described. The separation power of the nitric acid-acetonc system at different acid concentrations is analysed. Dowex I-X8 resin with a nitric acid-acetone solvent is shown to be sufficient for separation of the rare-earth elements by ion-exchange chromatography.
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