The selectivity of sorption of cerium-group rare-earth elements on acid-and base-treated fibrous complexing PAN3FOSPAN ampholyte from aqueous solutions containing acetate and butyrate anions was studied as influenced by pH. The possibility of separating Nd 3+ from Eu 3+ by eluent chromatography on PAN3FOSPAN was studied. The conditions for concentrating the sum of rare-earth elements on the resin were found.
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