Electric mobility of bivalent cations in the presence of an anionic polysaccharide

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Abstract
The electrophoretic mobilities of bivalent cations (Ca++ and Sr++) were measured in the presence of a linear anionic polysaccharide extracted from cartilage—chondroitin sulfate. The experimental results were analyzed according to Manning's treatment which involves only the charge‐density parameter ξ related to the structure of the polyion and the charge of the counterion. The comparison between the electrophoretic mobility and the self‐diffusion coefficient enabled us to determine the apparent charge of the counterions in the different domains of concentration.