Determination of traces of inorganic anions by means of high-performance liquid chromatography on zipaxsax columns

Abstract

Zipax-SAX pellicular beads are used as the anion-exchanger material ; a high-pressure packing technique is described. A Zipax-SAX column (200 × 4.5 mm) is used in a separation system with eluent suppression and conductivity detection as in ion-chromatography. Good separation of chloride, nitrite, bromide, nitrate and sulfate is obtained with 1.4 × 10-3 M succinate or adipate eluents at pH 7. A complete separation takes about 6 min at a flow rate of 3 ml min-1. Detection limits of 2 μg l-1 chloride, 4 μg l-1 nitrate and 10 μg l-1 sulfate can be reached if 2 ml of sample is preconcentrated.