Determination of bromate in highly saline samples using CZE with on-line transient ITP

✍ Scribed by Keiichi Fukushi; Ryohei Yamazaki; Takeshi Yamane

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 368 KB
• Volume: 32
• Category: Article
• ISSN: 1615-9306
• DOI: 10.1002/jssc.200800502

✦ Synopsis

Abstract

We developed CZE with direct UV detection for the determination of bromate in highly saline samples such as seawater and salts using transient ITP as an on‐line concentration procedure. The following optimum conditions were established: BGE, artificial seawater containing no bromide adjusted to pH 3.0; detection wavelength, 210 nm; vacuum injection period of sample, 18 s (378 nL); terminating ion solution, 600 mM sodium acetate; vacuum injection period of the terminating ion solution, 7 s (147 nL) for seawater and 12 s (252 nL) for salts; applied voltage, 7 kV with the sample inlet side as the cathode. The LOD for bromate was 30 μg/L (BrO~3~^–^–Br) with S/N of 3. The respective values of the RSD of the peak area, peak height, and migration time for bromate were 6.4, 1.5, and 0.51%. Seawater and salt samples, with bromate added, were analyzed using this method. The recovery of bromate in seawater samples was 85–105%. Linear regression equations relating area and height responses to concentration for bromate were obtained using the salt samples.