Organic fouling of an anion exchange resin results from the adsorption of the organics on its surface which block the diffusion of mobile ions inside the resin beads. As a result a decrease in a total capacity is observed. Generally the performance of anion exchangers is determined based on the breakthrough curves and studies of the adsorption kinetics.
One of the main problems concerning anion exchange resins is their susceptibility to fouling. The most important foulants of anion exchange resins include colloidal additives, iron and manganese compounds, organic impurities, free chlorine and dissolved oxygen. Each foulants affects the efficiency of the anion exchanger mainly by decreasing its capacity.
FTIR spectroscopy is quick and cost-effective method to identify the foulants, to assess degradation and deformation of the ion exchanger and for the determination of functional groups responsible for sorption of specific ions
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