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Author
Uraisin, K.
Nacapricha, D.
Lapanantnoppakhun, S.
Grudpan, K.
Motomizu, Shoji
Abstract

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.

Keywords
Stopped-flow injection
Kinetic spectrophotometry
Methylene blue
Bromide
Seawater
Note
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.
Published Date
2005-08-30
Publication Title
Talanta
Volume
volume68
Issue
issue2
Start Page
274
End Page
280
Content Type
Journal Article
language
英語
Refereed
True
DOI
Web of Sience KeyUT
Submission Path
analytical_chemistry/18