Please use this identifier to cite or link to this item:
Title: Low molecular weight dicarboxylic acids, ketoacids, and dicarbonyls in the fine particles from a roadway tunnel : possible secondary production from the precursors
Authors: Wang, H
Kawamura, K
Ho, KF
Lee, SC 
Issue Date: 2006
Source: Environmental science & technology, 2006, v. 40, no. 20, p. 6255-6260
Abstract: Low molecular weight dicarboxylic acids (DCAs), ketoacids, and α-dicarbonyls have been determined for the PM2.5 samples in a Hong Kong roadway tunnel, using a water extraction followed by a butyl ester and/or dibutyl acetal derivatization technique. For the most wintertime sampling runs, outlet and inlet concentrations of the quantified compounds were found to be quite similar (ca. 10% differences), leading to the conclusion that direct emissions of the organic compounds are insignificant from vehicles in hot-stabilized operations although vehicular emissions can provide important precursors to them. In contrast, a significant concentration increase of most compounds was observed at the outlet station compared to the inlet station in the summertime runs, which might be explained by the secondary production of aerosols in the tunnel. The organic compounds studied comprised a small fraction (<1%) of aerosol organic carbon (OC). In winter, their abundances relative to that of OC in outlet samples were found to be significantly less than those in inlet samples. On the basis of the summer data, apparent secondary production factors of the compounds were calculated, which indicate that adipic and m-phthalic acids can be favorably formed in the tunnel. However, like other DCAs, direct emissions of adipic, m-phthalic, and p-phthalic acids from automobiles are suggested to be insignificant.
Publisher: American Chemical Society
Journal: Environmental science & technology 
ISSN: 0013-936X
EISSN: 1520-5851
DOI: 10.1021/es060732c
Appears in Collections:Journal/Magazine Article

View full-text via PolyU eLinks SFX Query
Show full item record


Last Week
Last month
Citations as of Feb 17, 2020


Last Week
Last month
Citations as of Aug 21, 2020

Page view(s)

Last Week
Last month
Citations as of Sep 15, 2020

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.