Abstract
An alumina column is investigated as a stationary phase anion exchanger for the LC separation of inorganic anionic analytes. Mobile phase variables that strongly influence analyte anion retention and which can be optimized to affect separations of complex analyte anion mixtures are mobile phase pH, ionic strength, counteranion type and concentration, and, to a lesser extent, solvent composition. Analyte anion exchange selectivities on alumina are different when compared to selectivities on polystyrene divinylbenzene R/sub 4/N/sup +/ type anion exchangers. An alumina column provides excellent efficiency, selectivity, and resolution and can be used to separate complex analyte anion mixtures, including trace analytes in the presence of major components, with favorable analysis times. Well-defined chromatographic peaks are obtained and provide the basis for favorable detection limits and calibration curves over a wide concentration range. 27 references, 8 figures.
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