Abstract
The structure of stationary complexes in chelating resins has a strong impact on the course of the sorption and chromatography of mobile complex-forming compounds. The formation constants of stationary complexes of Cu2+ and of sorption complexes of Cu2+ with l-proline as the mobile ligand have been calculated under static conditions for two sorbents with iminodiacetic acid groups (I) and l-proline groups (II) as the stationary ligands. For sorbent II, there is an appreciable dependence of the sorption affinity for both the Cu2+ and the mobile ligand on the copper content of the system, whereas for sorbent I the affinity for Cu2+ is relatively constant. This difference in the behaviour of the two sorbents is directly associated with their efficiency in the ligand-exchange chromatographic process.
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