ABSTRACT
The ion exchanger contains an organic network with a fixed ionic group repeated throughout its three-dimensional structure. Steric factors in the ion-exchanger phase present a complexation depressing effect by restricting rotational and translational motion. Most metal ions are observed to form only the unidentate species. Because the nonideality of bound and free states is the same they cancel in the mass action expression for the unidentate complexation reaction. The use of absorption spectrometry to facilitate the analysis of complex formation between metal ions and anionic ligands in a particular ion exchanger is interfered with by the sizable light-scattering properties of the resin particles. When light-absorbing species are bound to the ion exchanger their absorbance is added to the high attenuation background.
