Effect of functional group structure on the selectivity of low-capacity anion exchangers for monovalent anions

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A number of macroreticular anion-exchange resins of low capacity weere prepared by chloromethylation of XAD-1 under meld conditions and reaction with the appropriate tertiary amine. These resins were then evaluated to determine their relative selectivities for 17 monovalent anions. While the relative affinity of the resins for some anions changes very little as the resin structure is altered, other anions exhibit pronounced changes. Explanations are given as to the probable cause of these effects and the practical implications of using chemical structure as a parameter in ion chromatography are discussed.