Preconcentration of Iron by Complexation and Ultrafiltration

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Abstract
We previously investigated the reactions of 1,2-dihydroxybenzene-3,5-di-sulfonic acid (Tiron) with metal ions for developing preconcentration techniques based on liquid-solid ion-exchange. The goals of these methods are the reduction of the detection limits and of matrix interferences in instrumental determinations, and their use in toxic metal removal from polluted waters. In this paper the effect of a cationic polyelectrolyte (Multifloc C 563, PROTEX) on the formation of iron-Tiron complexes and the effect on the behavior of such complexes in ultrafiltra-tion experiments are investigated. Discontinuous ultrafiltration experiments were performed with neutral membranes, and metal-ligan, ligand-C 563, and metal-ligand-C 563 systems were investigated. The operational conditions and the resutls of metal ion retention and preconcentration are presented.