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| Titel |
Spatial and temporal distributions of total and methyl mercury in precipitation in core urban areas, Chongqing, China |
| VerfasserIn |
Y. M. Wang, D. Y. Wang, B. Meng, Y. L. Peng, L. Zhao, J. S. Zhu |
| 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 ; 12, no. 20 ; Nr. 12, no. 20 (2012-10-18), S.9417-9426 |
| Datensatznummer |
250011515
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| Publikation (Nr.) |
 copernicus.org/acp-12-9417-2012.pdf |
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| Zusammenfassung |
| The spatial and temporal distribution patterns of mercury (Hg) in
precipitation were investigated in the core urban areas of Chongqing, China.
During the period from July 2010 to June 2011, total mercury (THg) and
methyl mercury (MeHg) concentrations in precipitation were analysed from
three sampling sites. Our results suggested that the volume-weight mean THg
and MeHg concentrations in precipitation were 30.67 ng l−1 and
0.31 ng l−1, respectively. The proportion of MeHg in THg ranged from 0.1% to
7.6% with a mean value of 1.3%. THg and MeHg concentrations showed
seasonal variations, while the highest THg value was measured in winter.
Contrarily, the highest MeHg concentration was observed in autumn.
Additionally, a geographically gradual decline of THg concentration in
precipitation was observed from the downtown to the suburb, then to the
controlled site in the city. 5 mm rainfall might be a threshold for the full
wash-out capability. Rainfall above 5 mm may have a diluting effect for the
concentrations of THg. Moreover, the current research implies that the coal
combustion and motor vehicles could be the dominant sources for Hg in the
precipitation. |
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