Analytical Sciences

Cyclodextrin-Aided Determination of Iodate and Bromate in Drinking Water by Microcolumn Ion Chromatography with Precolumn Enrichment

Yuko KITAMAKI and Toyohide TAKEUCHI

Department of Chemistry, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan

A selective and simple method for the determination of iodate (IO₃^-) and bromate (BrO₃^-) by microcolumn ion chromatography (IC) is presented. In this study, IO₃^- and BrO₃^- were determined as IBr₂^- and tribromide (Br₃^-), respectively, via a postcolumn reaction with bromide (Br^-) under acidic conditions with the aid of α-cyclodextrin (α-CD) in microcolumn IC. IO₃^- and BrO₃^- were selectively detected by the present method at a wavelength of 253 or 265 nm. The present system achieved good selectivity for IO₃^- and BrO₃^- as well as good repeatability under suitable conditions. Precolumn enrichment improved the detection limit, and allowed the determination of BrO₃^- in bottled water as low as sub µg L^-1 level in microcolumn IC.

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