ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 30, Number 4
JKCSEZ 30(4)
August 20, 1986 

Solvent extraction equilibria of alkali metal cation with crown ether (DC18C6, DC24C8) and HDEHP have been studied. The extraction equilibrium constants increase in the order of, in the DC18C6 system, Na+ < Cs+ < Rb+ < K+, and in the DC24C8 system, Rb+ < K+ < Cs+. The species extracted to organic phase are M1(crown ether)1 (HDEHP)1. The magnitude of extraction equilibrium constant is determined by the distribution ratio of crown ether between organic and aqueous phase, and stability constant of crown ether-alkali metal complex.