Competitive transport of alkali metal ions from aqueous solutions into toluene by highly lipophilic crown ether carboxylic acids

Abstract

Efficiencies and selectivities of competitive alkali metal transport into toluene by 2-((sym-dibenzo-16-crown-5)oxyl)-decanoic acid and (sym-bis(4(5)-tert-butylbenzo)-16-crown-5)oxy)acetic acid are determined in solvent extraction, bulk liquid membrane transport, and liquid surfactant membrane transport (water-in-oil-in-water emulsion) and compared with those previously measured for solvent extraction and bulk liquid membrane transport with chloroform as the organic phase. 4 figures, 2 tables.