“Ion-exchange chemistry” in Analytical and Solution Chemistry Researches

The nature of ion-exchanger phase as a special type of solution has been extensively investigated by spectroscopic and distribution methods. The anion exchange mechanism for metal elements has been interpreted in terms of coordination chemistry. Some new complexes of extremely high ligand number or polynuclear complexes, which can not be formed in ordinary solutions, have been found in anion-exchange resin phases, and their compositions have been determined, as well as their characteristic absorption spectra. A Donnan exclusion chromatography has been developed and applied to the separation for differently charged anions. The stability constants of metal complexes present in ion-exchanger phases have been evaluated by solid-phase spectrophotometry and 31P NMR spectrometry and compared with those in the corresponding solutions. An intrinsic complexation-enhancing effect of ion-exchangers has been observed and explained. An ion-exchanger phase spectrophotometry as a new ultra-sensitive method has been developed for a number of reagent systems and successfully applied to analyses of environmental samples. Some new polyphosphate compounds and new binding-isomers have been found by means of ion-exchange distribution analysis, absorption spectrophotometry and NMR spectrometry.