Abstract
We have defined the curves of potentiometric titration of H-forms of carboxylic polyacryl cation exchangers (Amberlite IRC 86, Dowex MAC 3, Lewatit CNP 80, Purolite C 104, Relite CNS) with calcium ions. The values of parameters for exchange isotherms within computational errors coincide. The better approximation of the titration curves was achieved within the framework of a model implying the presence in ion exchangers of two types of exchange centers and taking into account the impact of three neighboring fixed groups for each spatially separated center.
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