APPLICATION OF AMINO ACID-BONDED SILICAS AS ION-EXCHANGERS FOR THE SEPARATION OF ANIONS BY SINGLE-COLUMN ION CHROMATOGRAPHY

Different silica-immobilized amino acids were examined for use as stationary phases in single-column ion chromatography. Cation-exchange properties were established for phases with secondary amino groups (L-Arg-SiO2; L-Val-SiO2; L-Tyr-SiO2) and anion-exchange properties for phases with tertiary amino groUpS (L-Hypro-SiO2; L-Pro-SiO2). The correlations between retention times of inorganic anions, concentrations of carboxylic acid (oxalic, citric. acetic, succinic, tartaric) and pH of the eluents were determined.