ADSORPTION BEHAVIOR OF Pb, Cd, Ca, Al, Zn AND Co METAL IONS ON CATION EXCHANGE RESIN DOWEX 50 WX8 (NH4+ FORM) FROM AQUEOUS ACETONE-AMMONIUM PROPIONATE MEDIA.

Chemistry

In the field of inorganic chemistry separations, the incentive to explore the use of non-aqueous or mixed solvents has been the enhanced selectivity, discovered quite early in such media for Zeolites[1] and ion exchange resins [2]. The partial substitution of aqueous solution by organic solvent produces a number of changes in an exchange system, such as , change in the solution structure due to the interaction between water and the organic solvent, change in the hydration and salvation of the electrolyte, change in the solvent composition in the resin phase , change in the activity coefficients of the electrolyte in the solution phase as well as in the resin phase, change in the complexation of the metal ion and change in the extent of invasion by an electrolytes. All these changes are mutually dependent and affect the distribution of the metal ion. It is already known that, at equilibrium with a mixed solvent, because of the preferential up take of water by the resin, the solution composition in the resin phase often differs very much from that in the outer solution and the difference becomes greater with less polar organic solvents.

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