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ID 19941
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Author
Tsuboi, Tomonori
Hirano, Yoshio
Shibata, Yoshinori
Motomizu, Shoji
Abstract
The sensitivity improvement of a flow-injection spectrophotometric method for the determination of ammonia was examined based on an indophenol blue coloration reaction with salicylate and hypochlorite in the presence of manganese(II) as a reaction promotion catalyst. The optimal conditions for achieving higher sensitivity of ammonia determination were examined using a three-line flow system. The limit of detection corresponding to a signal-to-noise ratio (S/N) of 3 was 0.005 mg l(-1) (≡ 5 ppb) of NH(4)(+). A calibration graph was linear in the range from 5 ppb to 1000 ppb of ammonium ion. The relative standard deviations (n=9) for 50 ppb and 100 ppb of ammonium ion were 6.4% and 2.2%, respectively. The proposed method was applied to the determination of ammonia in the exhaust gas of a thermal power plant. Prior to the FIA determination, ammonia in the exhaust gas was absorbed into a boric acid solution; the absorption solution was then analyzed by the proposed FIA.
Published Date
2002-10-10
Publication Title
Analytical Sciences
Volume
volume18
Issue
issue10
Publisher
日本分析化学会
Start Page
1121
End Page
1125
ISSN
0910-6340
NCID
AA10500785
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
日本分析化学会
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DOI