Determination of bromate ion in drinking water by capillary zone electrophoresis with direct photometric detection
| Autor: | Shoji Motomizu, Makoto Ishida, Toshio Takayanagi, Rim Driouich, Julius Mbuna |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Detection limit
Chromatography Chemistry Bromates Organic Chemistry Analytical chemistry Electrophoresis Capillary Fresh Water General Medicine Buffers Bromate Biochemistry Analytical Chemistry Ion Matrix (chemical analysis) chemistry.chemical_compound Capillary electrophoresis Tap water Water Supply Calibration Water treatment Isotachophoresis Spectrophotometry Ultraviolet |
| Zdroj: | Journal of chromatography. A. 1128(1-2) |
| ISSN: | 0021-9673 |
| Popis: | Bromate ion in drinking water was determined by capillary zone electrophoresis (CZE) with direct photometric detection. Bromate ion in the sample solution was introduced and concentrated into the capillary by electrokenetic injection for 50 s at −10 kV. Electrophoretic separation was made at an applied voltage of −25 kV and bromate ion was detected at wavelength 193 nm, at which the baseline was stabilized with less UV-absorbing acidic phosphate buffer. Bromate ion was detected within 5 min in the electropherogram. By increasing the electric conductivity in the migrating solution with 10 mM Na2SO4, a limit of detection (LOD) of 9 × 10−10 M (0.1 μg/L BrO3−) was achieved. The proposed method was applied to the analysis of tap water and river water samples, but bromate ion was not detected. Because the practical samples contain relatively large amount of foreign ionic substances, the tap water sample was diluted to avoid the matrix ions. Bromate ion added in a tap water at the concentration of 8 × 10−8 M was quantitatively recovered by diluting it 1/10. |
| Databáze: | OpenAIRE |
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