Abstract
Alkali-metal cation sorption from aqueous and aqueous methanolic solutions and column concentration of alkalimetal cations from dilute aqueous solutions by carboxylic acid resins containing dibenzo-14-crown-4 units and their acyclic polyether analogues have been investigated. The crown ether carboxylic acid resins exhibit enhanced sorption selectivity over the acyclic polyether resins. Good sorption selectivity for LI - and Na + was obtained with a cyclic polyether resin in which the carboxylic acid group is positioned over the crown ether ring
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