Prediction of the retention values associated to the ultrafiltration of mixtures of metal ions and high molecular weight water-soluble polymers as a function of the initial ionic strength

The equations that relate the dissociation constants between divalent metal ions and polymer chains in aqueous solutions with the ionic strength are d eveloped from a model previously discussed-that gives account for the exper imental results obtained in ultrafiltration experiments. The relations foun d are used to predict the retention values at high filtration factors in ul trafiltration experiments corresponding to the systems poly(sodium 4-styren esulfonate)/Cd2+, and poly(vinylalcohol)/Pb2+ respectively, performed under variable initial ionic strength. (C) 2000 Elsevier Science B.V. All rights reserved.