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In ion chromatography using a high-capacity anion exchange column, such as TSKgel-SAX, and 0.5 M of a NaCl solution as eluent, sulfate was easily eluated from the column. In order to investigate the elution behavior of sulfate, the distribution coefficient (Kd) of mono and divalent anions was determined by the chromatographic method and batch method using TSKgel-SAX(4.3 meq/ml), TSKgel-ODS-80Ts(1.2 × 10-1 meq/ml) coated with cetyltrimethylammonium ion and TSKgel-IC-anion-PW(3.0 ×10-2 meq/ml) at various concentrations of NaCl solution. A plot of log Kd vs. log of the NaCl concentration gave a straight line, the slope of which agreed with the charge of the anions. In the TSKgel-SAX column, Kd of sulfate became samller than that of monovalent anions at a NaCl concentration greater than 0.2 M. This result suggested that sulfate was easily eluated from the column in ion chromatography using a high-concentration NaCl solution as the eluent.

Elution behavior of divalent anions in ion chromatography using a high concentration NaCl solution as an eluent.