CHELATING RESIN-IMPREGNATED PAPER-CHROMATOGRAPHY, APPLICATIONS TO TRACE-ELEMENT COLLECTION OF FERROUS AND FERRIC IONS, AND DETERMINATION BYDIFFERENTIAL-PULSE ANODIC-STRIPPING VOLTAMMETRY

An ion-exchange approach to the preparation of chelating resin is demo nstrated whereby a typical sulfonated chelating agent, 7-iodo-8-hydrox y quinoline-5-sulfonic acid, is immobilized as counterions on a pipera zinium polyelectrolyte matrix. The resulting chelate forming resin has been used to effect the selective separation of ferrous as well as fe rric ion from a known mixture containing other trace elements without any complication of the leaching of either chelating ligand or resin f rom the stationary support. The chelating resin-impregnated paper chro matographic technique followed with differential pulse anodic strippin g analysis is described for the preconcentration, separation, and reco very of divalent and trivalent ions of iron from the various heavy met als in aqueous phases. The combination of chelation and paper chromato graphy involves a differential migration procedure which provides a te chnique for the separation of analyte ions quantitatively without any interference from the complex matrices.