NOVEL POLYMERIC RESINS FOR ANION-EXCHANGE CHROMATOGRAPHY

A novel anion-exchange resin containing three amine groups was prepare d by reaction of a chloromethylated polystyrene-divinylbenzene (PS-DVB ) resin with diethylenetriamine. After being protonated by contact wit h an aqueous acid, this resin can be used for ion-chromatographic sepa ration of anions. The charge on the resins can be varied from +1 to +3 by changing the pH at which the ion chromatographic separation was ca rried out. The selectivity of the new ion exchangers for various inorg anic anions was quite different from conventional anion exchangers. Th e performance of this new anion exchanger was studied by changing the pH and the concentration of the eluent, and several different eluents were used with some common anions as testing analytes. Conductivity de tection and UV-Vis detection were applied to detect the anions after s eparation. The new resin can also be used for HPLC separation of neutr al organic compounds. Alkylphenols and alkylbenzenes were separated wi th this new polymeric resin, and excellent separations were obtained u nder simple conditions. (C) 1998 Elsevier Science B.V.