Permeation of cadmium through a supported liquid membrane impregnated withCYANEX 923

An experimental study of Cd(II) transport through a polymer-immobilised liq uid membrane (PILM) using Cyanex 923 as carrier has been performed. Factors affecting cadmium permeability, such as stirring speed of the source phase , extractant concentration in the membrane phase, metal, HCl and H3PO4 conc entrations in the source phase, etc., have been analyzed. Optimal experimen tal conditions for Cd(II) permeation and recovery (P-Cd = 34.3 mum/s and 85 .8% recovery) were obtained after 3 h using membranes containing 30% v/v Cy anex 923 dissolved in xylene, using a microporous Durapore GVHP support, wi th water as stripping agent and initial source phase of 0.89 muM Cd, and 10 0 g/L each of HCl and H3PO4. (C) 2001 Elsevier Science B.V. All rights rese rved.