Publication: Kinetic-spectrophotometric method for the determination of trace amounts of bromide in seawater
Issued Date
2006-01-15
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ISSN
00399140
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2-s2.0-30144445322
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Mahidol University
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SCOPUS
Bibliographic Citation
Talanta. Vol.68, No.3 (2006), 951-956
Suggested Citation
Kanchana Uraisin, Toshio Takayanagi, Mitsuko Oshima, Duangjai Nacapricha, Shoji Motomizu Kinetic-spectrophotometric method for the determination of trace amounts of bromide in seawater. Talanta. Vol.68, No.3 (2006), 951-956. doi:10.1016/j.talanta.2005.06.061 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/23181
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Title
Kinetic-spectrophotometric method for the determination of trace amounts of bromide in seawater
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Abstract
A novel simple, sensitive and rapid kinetic-spectrophotometric method is proposed for the determination of trace amounts of bromide. The method is based on its catalytic effect on the oxidation of methylene blue (MB) by hydrogen peroxide in strongly acidic solution. The oxidation reaction is activated by large amounts of chloride and can be monitored spectrophotometrically by measuring the decrease in the absorbance of MB at 746 nm. The determination of bromide is performed by a fixed-time method at the first 100 s from the initiation of the reaction. Unlike other kinetic-spectrophotometric methods for the determination of bromide, the proposed method does not require heating the solution. Bromide can be determined in the range from 80 to 960 μg l-1with the detection limit of 35 μg l-1. The relative standard deviation of ten replicate determination of 480 μg l-1bromide was 1.4%. The influence of potential interfering ions was studied. The proposed method was satisfactorily applied to the determination of bromide in seawater without interfering effect from chloride ion. © 2005 Elsevier B.V. All rights reserved.
