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ID 33042
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Author
Uraisin, Kanchana
Oshima, Mitsuko
Nacapricha, Duangjai
Motomizu, Shoji
Abstract

A novel simple, sensitive and rapid kinetic-spectrophotornetric 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 run. 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-spectrophotornetric 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 mu g l(-1) with the detection limit of 35 mu g l(-1). The relative standard deviation of ten replicate determination of 480 mu g l(-1) bromide 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.

Keywords
Kinetic-spectrophotometry
Methylene blue
Bromide
Seawater
Note
Published with permission from the copyright holder.
This is a author's copy,as published in TALANTA , 2006 Vol.68 Issue.3 pp.951-956
Publisher URL: http://dx.doi.org/10.1016/j.talanta.2005.06.061
Direct access to Thomson Web of Science record
(C) 2008 by Elsevier B.V.
Published Date
2005-08-11
Publication Title
Talanta
Volume
volume68
Issue
issue3
Start Page
951
End Page
956
Content Type
Journal Article
language
英語
Refereed
True
DOI
Web of Sience KeyUT
Submission Path
analytical_chemistry/19