EXTRACTION AND RELEASE OF METAL-IONS BY MICELLAR-ENHANCED ULTRAFILTRATION - INFLUENCE OF COMPLEXATION AND PH

The ionic exchange (IE) model has been used to predict the influence o f positive metal ion complexation upon micellar-enhanced ultrafiltrati on (MEUF) results, The three different systems studied were sodium dod ecyl sulfate-ethylene diamine tetra-acetic acid (EDTA)-Cu(II); SDS-Tar trate ion-Cu(II), and the hydrolysis of the uranyl ion-SDS, In the app ropriate experimental conditions, 98% of Cu(II) is recovered in the fi ltrate with the use of EDTA, The IE model allows for the accurate pred iction of Cu(II) release by the addition of tartrate ion as a function of pH. In the case of uranyl ion hydrolysis, the IE model showed that the UO2(OH)(2) species is not predominant under the experimental cond itions. (C) 1996 Academic Press, Inc.