EFFECT OF COEXISTING SUBSTANCES ON EXTRACTION OF GA BY LIQUID SURFACTANT MEMBRANE WITH 2-BROMODECANOIC ACID

The effects of sulfate ion and Al ion on extraction equilibrium and rate of Ga with 2-bromo decanoic acid (2BDA) were studied to estimate the influence of these substances on extraction of Ga using liquid surfactant membrane (LSM) containing 2BDA. The following points were confirmed. The extraction equilibrium of Ga-2BDA system is influenced by sulfate ion and Al ion; when sulfate ion coexists, the distribution ratio and the extraction rate of Ga are decreased because of formation of Ga-sulfate complex. On the other hand, the distribution ratio is increased when Al ion coexists. The rate-determining step in the extraction of Ga by LSM is diffusion of the Ga-2BDA complex in the organic phase or interfacial reaction between Ga and the extractant. Thus sulfate ion and Al ion influence the extraction of Ga in the LSM system.