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ID 33017
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Author
Li, Qiong
Sritharathikhum, Piyanete
Oshima, Mitsuko
Motomizu, Shoji
Abstract
In this paper, a novel detection reagent for formaldehyde determination is proposed, and is applied to a simple and highly sensitive flow injection method for the spectrophotometric determination of formaldehyde. The method is based on the reaction of formaldehyde with methyl acetoacetate in the presence of ammonia. The increase in the absorbance of the reaction product was measured at 375 nm. An inexpensive light emitting diode (LED)based UV detector (375 nm) was, for the first time, used. Under the optimized experimental conditions, formaldehyde in an aqueous solution was determined over the concentration range from 0.25 to 20.0 x 10(-6) M with a liner calibration graph; the limit of detection (LOD) of 5 x 10(-8) M (1.5 mu g L-1) was possible. The relative standard deviation of 12 replicate measurements of 5 X 10(-6) M formaldehyde was 1.2%. Maximum sampling throughput was about 21 samples/h. The effect of potential interferences such as metals, organic compounds and other aldehyde was also examined. The analytical performance for formaldehyde determination was compared with those obtained by the conventional acetylacetone method, which uses visible absorption spectrophotometry. Finally, the proposed method was successfully applied to the determination of formaldehyde in natural water samples.
Keywords
Flow injection
Formaldehyde determination
Spectrophotometry
Methyl acetoacetate
UV-light emitting diode (LED)
Note
Published with permission from the copyright holder.
This is a author's copy, as published in Analytica Chimica Acta , 2008 Vol.612 Issue.2 pp.165-172
Publisher URL: http://dx.doi.org/10.1016/j.aca.2008.02.028
Direct access to Thomson Web of Science record14
© 2008 by Elsevier B.V.
Published Date
2008-04
Publication Title
Analytica Chimica Acta
Volume
volume612
Issue
issue2
Publisher
Elsevier Science B.V.
Start Page
165
End Page
172
ISSN
0003-2670
NCID
AA00524834
Content Type
Journal Article
language
英語
Copyright Holders
Elsevier Science B.V.
File Version
author
Refereed
True
DOI
Web of Sience KeyUT
Submission Path
analytical_chemistry/17