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| Titel |
Characterisation of individual aerosol particles collected during a haze episode in Incheon, Korea using the quantitative ED-EPMA technique |
| VerfasserIn |
H. Geng, J. Y. Ryu, S. Maskey, H.-J. Jung, C.-U. Ro |
| 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 ; 11, no. 3 ; Nr. 11, no. 3 (2011-02-15), S.1327-1337 |
| Datensatznummer |
250009310
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| Publikation (Nr.) |
 copernicus.org/acp-11-1327-2011.pdf |
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| Zusammenfassung |
| A quantitative energy-dispersive electron probe X-ray microanalysis (ED-EPMA),
called low-Z particle EPMA, was used to analyse individual aerosol particles
collected in Incheon, Korea on 13–18 October 2008 (a typical haze episode
occurred from 15 to 18 October). Overall 3600 individual particles in
PM2.5-10 and PM1.0-2.5 fractions from 12 aerosol samples collected
on haze and non-haze days were analysed. The analysed particles were
classified, based on their X-ray spectral data together with their secondary
electron images. The major particle types included organic carbon (OC),
elemental carbon (EC), sea-salt, mineral dust (such as aluminosilicate,
SiO2, CaCO3/CaMgCO3, etc.),
(NH4)2SO4/NH4HSO4-containing, K-containing,
Fe-rich and fly ash particles. Their relative number abundance results
showed that OC particles were significantly increased while sea-salts and
mineral dust particles were significantly decreased (especially in
PM1.0-2.5 fraction) when haze occurred. For the other particle types (except Fe-rich particles in PM2.5-10 fraction), there were no
significant differences in their relative abundances between haze and
non-haze samples. On non-haze days, the nitrate-containing reacted sea-salt
and mineral dust particles in PM1.0-2.5 fraction significantly
outnumbered the sulfate-containing ones, whereas it was the reverse on haze
days, implying that on haze days there were special sources or formation
mechanisms for fine aerosol particles (≤2.5 μm in aerodynamic
diameter). The emission of air pollutants from motor vehicles and stagnant
meteorological conditions, such as low wind speed and high relative humidity,
might be responsible for the elevated level of OC particles on haze days. |
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