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| Titel |
Dicarboxylic acids, metals and isotopic compositions of C and N in atmospheric aerosols from inland China: implications for dust and coal burning emission and secondary aerosol formation |
| VerfasserIn |
G. Wang, M. Xie, S. Hu, S. Gao, E. Tachibana, K. Kawamura |
| 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 ; 10, no. 13 ; Nr. 10, no. 13 (2010-07-06), S.6087-6096 |
| Datensatznummer |
250008603
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| Publikation (Nr.) |
 copernicus.org/acp-10-6087-2010.pdf |
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| Zusammenfassung |
| Dicarboxylic acids (C2–C10), metals, elemental
carbon (EC), organic carbon (OC), and stable isotopic compositions of total
carbon (TC) and total nitrogen (TN) were determined for PM10 samples
collected at three urban and one suburban sites of Baoji, an inland city of
China, during winter and spring 2008. Oxalic acid (C2) was the dominant
diacid, followed by succinic (C4) and malonic (C3) acids. Total
diacids in the urban and suburban areas were 1546±203 and 1728±495 ng m−3 during winter
and 1236±335 and 1028±193 ng m−3 during spring. EC in the urban and the suburban atmospheres were
17±3.8 and 8.0±2.1 μg m−3 during winter and 20±5.9
and 7.1±2.7 μg m−3 during spring, while OC at the urban
and suburban sites were 74±14 and 51±7.9 μg m−3 in
winter and 51±20 and 23±6.1 μg m−3 in spring.
Secondary organic carbon (SOC) accounted for 38±16% of OC in
winter and 28±18% of OC in spring, suggesting an enhanced
photochemical production of secondary organic aerosols in winter under an
inversion layer development. Total metal elements in winter and spring were
34±10 and 61±27 μg m−3 in the urban air and 18±7
and 32±23 μg m−3 in the suburban air. A linear
correlation (r2>0.8 in winter and r2>0.6 in spring) was
found between primary organic carbon (POC) and Ca2+/Fe, together with a
strong dependence of pH value of sample extracts on water-soluble inorganic
carbon, suggesting fugitive dust as an important source of the airborne
particles. Polycyclic aromatic hydrocarbons (PAHs), sulfate, and Pb in the
samples well correlated each other (r2>0.6) in winter, indicating
an importance of emissions from coal burning for house heating. Stable
carbon isotope compositions of TC (δ13C) became higher
with an increase in the concentration ratios of C2/OC due to aerosol
aging. In contrast, nitrogen isotope compositions of TN (δ15N) became lower with an increases in the mass ratios of
NH4+/PM10 and NO3−/PM10, which is possibly
caused by an enhanced adsorption and/or condensation of gaseous NH3 and
HNO3 onto particles. |
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