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Applicability of a Supported Liquid Membrane in the Enrichment and Determination of Cadmium from Complex Aqueous
Núria Pont1, Victòria Salvadó2, Clàudia Fontàs3
1Department of Chemistry, University of Girona, C/Maria Aurèlia Capmany 69, 17003 Girona, Spain. nuri__pont@hotmail.com.
Abstract:
A supported liquid membrane is developed for the separation of Cd from either high in salinity or acidity aqueous media. The membrane consisted of a durapore (polyvinylidene difluoride) polymeric support impregnated with a 0.5 M Aliquat 336 solution in decaline. The effect of carrier concentration, organic solvent and feed and receiving solutions on the metal permeability is studied. This system allows the effective transport of trace levels of Cd through the formation of CdCl₄2−, which is the predominant species responsible for the extraction process, in both NaCl and HCl solutions. The supported liquid membrane system in a hollow fibre configuration allows the enrichment and separation of trace levels of Cd from spiked seawater samples, facilitating the analytical determination of this toxic metal.
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