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| Titel |
Characteristics of trace metals in traffic-derived particles in Hsuehshan Tunnel, Taiwan: size distribution, potential source, and fingerprinting metal ratio |
| VerfasserIn |
Y.-C. Lin, C.-J. Tsai, Y.-C. Wu, R. Zhang, K.-H. Chi, Y.-T. Huang, S.-H. Lin, S.-C. Hsu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 8 ; Nr. 15, no. 8 (2015-04-21), S.4117-4130 |
| Datensatznummer |
250119655
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| Publikation (Nr.) |
 copernicus.org/acp-15-4117-2015.pdf |
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| Zusammenfassung |
| Traffic emissions are a significant source of airborne particulate matter
(PM) in ambient environments. These emissions contain an abundance of
toxic metals and thus pose adverse effects on human health.
Size-fractionated aerosol samples were collected from May to September 2013
by using micro-orifice uniform deposited impactors (MOUDIs). Sample
collection was conducted simultaneously at the inlet and outlet sites of
Hsuehshan Tunnel in northern Taiwan, which is the second-longest freeway
tunnel (12.9 km) in Asia. This endeavor aims to characterize the chemical
constituents and size distributions, as well as fingerprinting ratios of
particulate metals emitted by vehicle fleets. A total of 36 metals in
size-resolved aerosols were determined through inductively coupled plasma
mass spectrometry. Three major groups – namely, tailpipe emissions (Zn, Pb,
and V in fine mode), wear debris (Cu, Cd, Fe, Ga, Mn, Mo, Sb, and Sn), and
resuspended dust (Ca, Mg, K, and Rb) – of airborne PM metals were categorized
on the basis of the results of enrichment factor, correlation matrix, and
principal component analysis. Size distributions of wear-originated metals
resembled the pattern of crustal elements, which were predominated by
super-micron particulates (PM1–10). By contrast, tailpipe exhaust
elements such as Zn, Pb, and V were distributed mainly in submicron
particles. By employing Cu as a tracer of wear abrasion, several inter-metal
ratios – including Fe / Cu (14), Ba / Cu (1.05), Sb / Cu (0.16), Sn / Cu (0.10), and
Ga / Cu (0.03) – served as fingerprints for wear debris. However, the data set
collected in this work is useful for further studies on traffic emission
inventory and human health effects of traffic-related PM. |
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