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| Titel |
Concentrations and solubility of trace elements in fine particles at a mountain site, southern China: regional sources and cloud processing |
| VerfasserIn |
T. Li, Y. Wang, W. J. Li, J. M. Chen, T. Wang, W. X. Wang |
| 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. 15 ; Nr. 15, no. 15 (2015-08-13), S.8987-9002 |
| Datensatznummer |
250119963
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| Publikation (Nr.) |
 copernicus.org/acp-15-8987-2015.pdf |
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| Zusammenfassung |
| The
concentrations and solubility of twelve trace elements in PM2.5 at Mt.
Lushan, southern China, were investigated during the summer of 2011 and the
spring of 2012. The average PM2.5 mass was
55.2 ± 20.1 μg m−3 during the observation period.
Temporal variations of all trace elements including total and water-soluble
fractions with several dust storm spikes in total fractions of Al and Fe were
observed. The enrichment factor (EF) values were 1 order of magnitude higher
for the water-soluble fractions versus the total fractions of trace elements.
Four major emission sources, namely nonferrous metal mining and smelting (for
Cr, As, Ba and parts of Zn), coal combustion (for Pb, Zn, Se, Cu and Mn),
crustal materials (for Al and Fe) and municipal solid waste incineration (for
Cd and Mo), were classified by principal component analysis (PCA). Trajectory
cluster analysis and the potential source contribution function (PSCF)
consistently identified the Yangtze River delta (YRD), the Pearl River delta
(PRD), and the neighbouring provinces
of Mt. Lushan as the major source regions and transport pathways for
anthropogenic elements. Northern China was identified as a major source
region for crustal elements. It should be noted that apart from the YRD, the
area around Mt. Lushan has become the most significant contributor to the
solubility of most trace elements. Element solubility can be partially
determined by emission sources. However, enhanced solubility of trace
elements corresponding to increased concentrations of
sulfate after the occurrence of cloud
events indicated significant effects of cloud processing on aerosol element
dissolution. Metal particles mixed with sulfate in cloud droplet residues
were further investigated through transmission electron microscopy (TEM)
analysis. Irreversible alteration of particle morphology by cloud processing
was confirmed to be highly responsible for the enhancement of trace element
solubility. The findings from this study imply an important role of regional
anthropogenic pollution and cloud processing in the evolution of aerosol
trace element solubility during transport in the troposphere. |
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