Ion Permselectivity of Liquid Membrane Containing Dibenzo-30-crown-10 as a Carrier

Abstract

Various factors affecting ion permselectivity of a liquid membrane containing dibenzo-30crown-10 as a carrier were studied. Experiment on diffusion of potassium or sodium ion from salt solution to pure water across a liquid membrane was carried out. The complex containing polyether ring of dibenzo-30-crown-10 and potassium ion is steric and stable; this liquid membranehad some characteristic permselectivities. ( 1 ) The greater the ET value of the solvent of this liquid membrane, the greater became a flux and permselectivity. (2) The smaller the ratio of anionic charge to ionic radius, the greater became a flux and permselectivity. ( 3 )An increase in permeability of alkaline metal ions was the following order: Li⁺<Na⁺<Cs⁺<K⁺<Rb⁺.