Abstract
A novel silica-based anion exchanger for single-column ion chromatography was prepared by immobilizing a quaternary ammonium salt of cyanuric chloride onto the surface of silane-modified silica-gel. A stationary phase with low capacity (0.38 mequiv./g) was obtained and effective separation of monovalent anions was achieved with a concentration of tartaric acid or o-phthalic acid lower than 0.5 m M on a short column prepared using a conductometric detector. Factors that can affect the retention behaviour, such as eluent species, eluent concentration and eluent pH, were examined. The results demonstrate that the retention of anions is dominantly governed by ion-exchange interactions. However, the matrix effect due to the interaction between the stationary phase and the eluent may also play an important role.
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