Abstract
The metal ion distributions of a solution of poly(sodium 4-styrenesulfonate) in the presence of Cd2+ and Na+ ions are obtained by ultrafiltration. The results are used to evaluate the Manning's two-variable counterion condensation theory concerned with long-range interactions. The original theory results are insufficient to explain the metal ion distributions obtained, and short-range interactions have to be included. We also propose the inclusion of the influence of the polymer conformations in the theory.
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