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Dicarboxylic acids, ketocarboxylic acids and dicarbonyls in the urban roadside area of Hong Kong

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Title: Dicarboxylic acids, ketocarboxylic acids and dicarbonyls in the urban roadside area of Hong Kong
Authors: Ho, K.F. Browse this author
Lee, S.C. Browse this author
Cao, J.J. Browse this author
Kawamura, Kimitaka Browse this author →KAKEN DB
Watanabe, Tomomi Browse this author
Cheng, Y. Browse this author
Chow, Judith C. Browse this author
Keywords: Dicarboxylic acids
Ketocarboxylic acids
Dicarbonyls
Seasonal variations
Hong Kong
Issue Date: Jun-2006
Publisher: Elsevier Ltd.
Journal Title: Atmospheric Environment
Volume: 40
Issue: 17
Start Page: 3030
End Page: 3040
Publisher DOI: 10.1016/j.atmosenv.2005.11.069
Abstract: Homologous dicarboxylic acids (C2–C12), ketocarboxylic acids (ωC2–ωC9, pyruvic acid) and dicarbonyls (glyoxal and methylglyoxal) have been studied in the urban aerosol samples (PM2.5) collected from the Hong Kong roadside atmosphere during winter and summer of 2003 using a capillary GC and GC-MS method. The concentrations of total dicarboxylic acids, ketocarboxylic acids, and α-dicarbonyls were higher in winter than in summer (except for some species like phthalic acid, Ph). Oxalic (C2) acid was found as the most abundant species in summer, followed by Ph. Oxalic (C2) acid was also found as the most abundant species in winter, but followed by malonic (C3) acid. The C2 diacid comprised 28–66% of the total diacid concentrations. The diacids with higher carbon numbers were less abundant, although C9 diacid was relatively abundant (2%). Glyoxylic acid (ωC2) and methylglyoxal were found as the most abundant ketocarboxylic acid and dicarbonyl in both seasons, respectively. The concentrations of the total diacids, total ketoacids and total dicarbonyls ranged from 224 to 1381 ng m−3, 10 to 89 ng m−3 and 5 to 21 ng m−3, respectively. Their relative abundances in PM2.5 mass were 1.18%, 0.06% and 0.02%, respectively. High concentrations of toluene (winter: 33.8 μg m−3; summer: 41.3 μg m−3) and naphthalenes (winter: 1.2 μg m−3; summer: 1.9 μg m−3) observed were one possible source for the abundant phthalic and also methylmaleic acids detected.
Relation: http://www.sciencedirect.com/science/journal/13522310
Type: article (author version)
URI: http://hdl.handle.net/2115/26147
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 河村 公隆

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OAI-PMH ( junii2 , jpcoar )


 

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