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Simultaneous determination of bromide and iodide ions by capillary isotachophoresis using quaternary ammonium salts
Authors:Keiichi Fukushi   Kazuo Hiiro
Affiliation:

a Research Institute for Marine Cargo Transportation, Kobe University of Mercantile Marine, 5-1-1 Fukaeminami-machi, Higashinada-ku, Kobe 658, Japan

b Kobe Women's Junior College, 4-7-2 Minatojimanaka-machi, Chuo-ku, Kobe 650, Japan

Abstract:Bromide and iodide ions were determined simultaneously by capillary isotachophoresis using an aqueous electrolyte system; the separation principle was based on the ion-pairing equilibria between tetradecyldimethylbenzylammonium ion and these anions in the leading electrolyte. The interaction between iodide ion and tetradecyldimethylbenzylammonium ion was stronger than that for bromide ion. Thus complete separation of bromide and iodide ions could be obtained by using a leading electrolyte containing 1.5 mM tetradecyldimethylbenzylammonium ion. The pH of the leading electrolyte was adjusted to 5.0. The relative standard deviations of the zone length for bromide and iodide ions were 1.1 and 1.2%, respectively, when mixture of 3.0 mM of these ions was analysed. A 150-μl volume could be injected for the simultaneous determination of low concentrations of bromide and iodide ions.
Keywords:Isotachophoresis   Buffer composition   Bromide   Iodide   Quaternary ammonium compounds
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