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| Titel |
Atmospheric wet deposition of mercury and other trace elements in Pensacola, Florida |
| VerfasserIn |
W. M. Landing, J. M. Caffrey, S. D. Nolek, K. J. Gosnell, W. C. Parker |
| 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. 10 ; Nr. 10, no. 10 (2010-05-26), S.4867-4877 |
| Datensatznummer |
250008482
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| Publikation (Nr.) |
 copernicus.org/acp-10-4867-2010.pdf |
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| Zusammenfassung |
| In an effort to understand and quantify the impact of local, regional, and
far-distant atmospheric mercury sources to rainfall mercury deposition in
the Pensacola, Florida watershed, a program of event-based rainfall sampling
was started in late 2004. Modified Aerochem-Metrics wet/dry rainfall
samplers were deployed at three sites in the region around the Crist
coal-fired power plant and event-based samples were collected continuously
for three years. Samples were analyzed for total Hg and a suite of trace
elements including Al, As, Ba, Bi, Cd, Ce, Co, Cr, Cs, Cu, Fe, Ga, La, Li,
Mg, Mn, Na, Nb, Ni, P, Pb, Sb, Se, Si, Sn, Sr, Th, U, V, and Zn. Nutrients
(ammonia and nitrate) and major anions (chloride and sulfate) were also
measured on each sample. Multivariate statistical methods were used to sort
these tracers into factors that represent potential source categories
contributing to the rainfall chemistry. As, Hg, Sb, Se, Sn, and non sea-salt
sulfate were all significantly correlated (R>0.6) with one factor which we
interpret as an anthropogenic source term reflecting input from coal
combustion throughout the southeastern US. Using ratios of total Hg to
volatile elements, we estimate that 22–33% of the rainfall Hg results
from coal combustion in the southeastern US with the majority coming from
the global background. |
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