Determination of Acidity in the Interior of the Cross-Linked Polyelectrolyte Grain by the Use of pH-Sensitive Probes
Circumstantial evidence12 suggests that the state of water in ionite micropores and the acidity of the medium significantly differ from the ones in solution contacting the sorbent. Therefore, the conditions existing in the interior of ionite grains may not be approximated by measurements in solutions, which are performed by researchers. However, it is precisely these conditions that determine complexating processes or catalysis using sorbents as catalysts. Recently, the synthesis of stable nitroxyl radicals (NR) which are sensitive to changes of medium acidity in connection with participation in reactions of proton exchange and may be used as pH-probes, has been carried out.3 4 Using the electron spin resonance spectroscopy (ESR) method, the principal possibility to measure pH-value in a solution at the site of radicals location as well as in micropores of ionites appeared.
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