AbstractThe adsorption of trimethylammonium glycol chitosan iodide (TGCI) on Dowex CCR‐2 resin was investigated at different pH values and resin weights. The concentration of Na+or Ca2+ions, released by the ion exchange reaction with TGCI, was measured by inductively coupled plasma spectroscopy. It was found that the amount of the released ions is comparable to that of the absorbed TGCI. This indicates that the salt‐linkage formation of carboxylate ions of the exchanger with ⊕N(CH3)3‐groups in TGCI follows a stoichiometric relationship. This result is discussed in connection with the form of the polymer layer adsorbed on the solid