Water‐soluble polyelectrolytes containing carboxylic acid groups were investigated as polychelatogens, in view to study their metal ion binding properties, using the liquid‐phase polymer‐based retention technique under different experimental conditions. The divalent metal ions investigated were: Co2+, Cu2+, Zn2+, and Cd2+. When the pH increased above 3, and especially at pH 5, metal ion retention capability increased as the majority of the functional groups are carboxylate, which can form more stable complexes with the metal ions. The retention capability also depended on the structure of the polyelectrolyte and the filtration factor, Z.
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Rivas et al. (2006) studied this question.
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