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ID 33040
フルテキストURL
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著者
Uraisin, K. Department of Chemistry, Faculty of Science, Okayama University
Nacapricha, D. Department of Chemistry, Faculty of Science, Mahidol University
Lapanantnoppakhun, S. Department of Chemistry, Faculty of Science, Chiang Mai University
Grudpan, K. Department of Chemistry, Faculty of Science, Chiang Mai University
Motomizu, Shoji Department of Chemistry, Faculty of Science, Okayama University
抄録

A simple, sensitive and selective method for the determination of bromide in seawater by using a flow injection/stopped-flow detection technique was examined. The detection system was developed for a new kinetic-spectrophotometric determination of bromide in the presence of chloride matrix without any extraction and/or separation. The detection was based on the kinetic effect of bromide on the oxidation of methylene blue (MB) with hydrogen peroxide in a strongly acidic solution. Large amounts of chloride could enhance the sensitivity of the method as an activator. The decolorisation of the blue color of MB was used for the spectrophotometric determination of bromide at 746 nm. A stopped-flow approach was used to improve the sensitivity of the measurement and provide good linearity of the calibration over the range of 0-3.2 p,g ml(-1) of bromide. The relative standard deviation was 0.74% for the determination of 2.4 jig ml(-1) bromide (n=5). The detection limit (3 sigma) was 0.1 mu g ml(-1) with a sampling frequency of 12 h(-1). The influence of potential interfering ions was studied. The proposed method was applied to the determination of bromide in seawater samples and provided satisfactory results.

キーワード
Stopped-flow injection
Kinetic spectrophotometry
Methylene blue
Bromide
Seawater
備考
Published with permission from the copyright holder.
This is a author's copy,as published in TALANTA , 2005 Vol.68 Issue.2 pp.274-280
Publisher URL: http://dx.doi.org/10.1016/j.talanta.2005.07.055
Direct access to Thomson Web of Science record
(C) 2008 by Elsevier B.V.
発行日
2005-08-30
出版物タイトル
Talanta
68巻
2号
開始ページ
274
終了ページ
280
資料タイプ
学術雑誌論文
言語
English
査読
有り
DOI
Web of Sience KeyUT
Submission Path
analytical_chemistry/18