Ion chromatographic system with a novel switching suppression device

• Published in: Journal of Chromatography A Vol. 956; no. 1; pp. 53 - 58
• Main Authors: Sato, Shinji, Ogura, Yutaka, Miyanaga, Akiyoshi, Sugimoto, Tadanori, Tanaka, Kazuhiko, Moriyama, Hiroyuki
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 17.05.2002; Elsevier
• Subjects: Analytical chemistry; Chemistry; Chromatographic methods and physical methods associated with chromatography; Chromatography, Liquid - instrumentation; Exact sciences and technology; Inorganic anions; Other chromatographic methods; Reproducibility of Results; Sensitivity and Specificity; Instrumentation; Suppressor; Ion chromatography; Switching valve; Inorganic anions; Phosphates; Peak resolution; Chemical analysis; Nitrites; Number of theoretical plates; Nitrates; Calibration; Sulfates; Electrochemical detector; Inorganic anion; Conductometry; Halides; Detection limit; Ion suppressor; Quantitative analysis
• ISSN: 0021-9673
• DOI: 10.1016/S0021-9673(02)00445-4

Ion chromatography (IC) has been a powerful tool for measuring ionic species in environmental samples such as tap, river and drain waters. Suppressor modules (membrane and disposable column types) have been used for reducing the background of a baseline. A new type of suppressor device, which has a suppressor resin and switching valve was developed. Fresh ionic resin is introduced into a groove for each analysis to perform the suppression of the working eluent. The eluent composition for obtaining higher sensitivity and better resolutions among ionic species and carbonate ion was also investigated. Although carbonate buffers are used for ion separation in general, the separation of carbonate ion from other ions was not achieved. A borate eluent resulted in good resolutions and higher sensitivity. A new column was also developed for obtaining higher column efficiency and resolution. The optimization of anion separation using a new IC system (IC-2001) that consists of a new suppressor device, an anion-exchange column (TSKgel SuperIC-Anion, 150×4.6 mm), an autosampler, a conductivity cell and a pump in a compact module is described.