Abstract
Elution chromatography with a tertiary pyridine resin has been used to separate the trivalent actinides (An 3+ ) from the lanthanides (Ln 3+ ) using an alcoholic hydrochloric acid solvent. Trivalent Am and Cm were separated from the Ln by employing a 1 cm (Ø)×10 cm resin column with the mixed solvent system composed of concentrated hydrochloric acid (HCl) and alcohols. The distribution coefficients ( K d ) and the separation factors between An and Ln ( α Ln An ) increased as the alcohol content of the solvent mixture increased. On the other hand, the K d and α Ln An decreased drastically upon the addition of water to the solvent mixture. Among the four alcohols investigated (methanol, ethanol, n -propanol and n -butanol), the ethanol–HCl mixed solvent system showed the largest K d and α Ln An . The mechanism of adsorption for An and Ln cations on the pyridine resin is discussed in addition to the results presented herein.
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