| Summary: |
The extraction and transport of Cd(II) and Pb(II) in sup-ported liquid membrane (SLM) using TOPO and D2EHPA as mobile carriers was studied. The liquid-liquid extraction tests showed a maximum distribution coefficient when the carrier concentration was greater than 10-3 M. In transport experiments, the trans-membrane flux increased with in-creasing carrier concentration reaching a limiting value at greater than 10-3 M concentration. An impregnation time of 1 hour of the support in the organic phase is necessary for giving a good efficiency to the SLM. The optimum of other fundamental parameters (carrier concentration, metal con-centration and support characteristics) was determined. The diffusivity was significantly higher using Celgard 2400 support with respect to Celgard 2500, 2402 and 3401. A comparative study of the transport across such a membrane con-taining TOPO or D2EHPA has shown that the Cd(II) and Pb(II) transport efficiency was decreased using a mixture of both. |