Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Original Papers
Flow-Injection Spectrophotometric Determination of Bromate in Bottled Drinking Water Samples Using Chlorpromazine Reagent and a Liquid Waveguide Capillary Cell
Ildikó V. TÓTHInês C. SANTOSCláudia F. M. AZEVEDOJorge F. S. FERNANDESRicardo N. M. J. PÁSCOARaquel B. R. MESQUITAAntónio O. S. S. RANGEL
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2013 Volume 29 Issue 5 Pages 563-570

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Abstract

In this work, aiming to develop a simple, inexpensive method for the determination of low bromate levels in water samples, a liquid waveguide capillary cell (LWCC) was coupled to a FIA system. The long optical path (100 cm) of the LWCC was used to improve the sensitivity and the limit of detection without resorting to any off-line or in-line preconcentration processes. The spectrophotometric determination was based on the oxidation of chlorpromazine by bromate in an acidic medium, resulting in the formation of a colored radical product. Sulfamic acid was added to the reagent for minimizing the interference of nitrite, and a chelating ion exchange resin was used to remove major cationic interferences. The developed system allowed the determination of bromate within the range between 1 – 20 μg L−1 with a detection limit of 0.2 μg L−1.

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© 2013 by The Japan Society for Analytical Chemistry
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