Sorption von Silber an chlormethyliertem Polystyrol

Silver ions are bound on polystyrene containing ? CH₂Cl groups with a distribution coefficient of about 100 ml/g, but they are not bound on polystyrene itself. This indicates direct interaction between Ag⁺ ions and the chlorine atoms of the ? CH₂Cl groups in the sense of formation of a 1:1 complex. In presence of 0.1 mol/l of ammonium ions somewhat smaller distribution coefficients are found in the range from pH 4 to pH 6. In presence of 10^?3 mol/l of Na₂S₂O₃ the distribution coefficients are only about 6 ml/g. From solutions, however, containing 1 mol/l of NaCl or 0.1 mol/l of Na₂S₂O₃ or 10^?3 mol/l of NaCN, silver is not sorbed in measurable amounts, because complexation in solution predominates.