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Selective determination of ammonium ions by high-speed ion-exclusion chromatography on a weakly basic anion-exchange
Masanobu Mori1, Kazuhiko Tanaka, Murad I H Helaleh
1National Institute and Advanced Industrial Science and Technology at Seto, 110 Nishiibara-cho, Seto, Aichi 489-0884, Japan. masanobu-mori@aist.go.jp
Abstract:
This paper describes an ion-exclusion chromatographic system for the rapid and selective determination of ammonium ion. The optimized ion-exclusion chromatographic system was established with a polymethacrylate-based weakly basic anion-exchange resin column (TSKgel DEAE-5PW) as the separation column, an aqueous solution containing 0.05 mM tetramethylammonium hydroxide (pH 9.10) as eluent with conductimetric detection for the analyte determination. Under the optimum chromatographic conditions, ammonium ion was determined within 2.3 min with a detection limit (S/N=3) better than 0.125 microM. Ammonium ion in rain and river waters was precisely determined using this ion-exclusion chromatographic system.