SORPTION OF METALS BY AN AMIDOXIME CHELATING RESIN - PART I - EQUILIBRIUM

The complexation equilibrium of metals (copper, lead, and zinc) by usi ng a chelating ion-exchange resin (Duolite ES-346) is analyzed. Two po tentiometric titrations of the resin which allow evaluation of the exc hange capacity and the pK values are carried out. Two equilibrium mode ls (mass action type model and surface complex formation model) are pr oposed, and their parameters are estimated by fitting model equations to data from batch experiments. The degradation of the amidoxime group s in acidic media and a possible way to minimize that problem is discu ssed.