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| Titel |
In situ measurements of speciated atmospheric mercury and the identification of source regions in the Mexico City Metropolitan Area |
| VerfasserIn |
A. P. Rutter, D. C. Snyder, E. A. Stone, J. J. Schauer, R. Gonzalez-Abraham, L. T. Molina, C. Márquez, B. Cárdenas, B. Foy |
| 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 ; 9, no. 1 ; Nr. 9, no. 1 (2009-01-13), S.207-220 |
| Datensatznummer |
250006640
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| Publikation (Nr.) |
 copernicus.org/acp-9-207-2009.pdf |
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| Zusammenfassung |
In order to expand the currently limited understanding of atmospheric
mercury source-receptor relationships in the Mexico City Metropolitan Area,
real time measurements of atmospheric mercury were made at a downtown urban
site, and a rural site on the outskirts of Mexico City, during March 2006.
Numerous short-lived increases in particulate mercury (PHg) and reactive
gaseous mercury (RGM) concentrations were observed at the urban site during
the 17 day study, and less frequent increases in gaseous elemental mercury
(GEM) concentrations were measured at both the urban and rural sites. The
episodic increases observed were attributed to plume impacts from industrial
point source emissions in and around Mexico City. Average concentrations and
standard deviations measured during the study were as follows: i) urban
site; PHg=187±300 pg m−3, RGM=62±64 pg m−3, GEM=7.2±4.8 ng m−3,
and; ii) rural site; GEM=5.0±2.8 ng m−3.
Several source regions of atmospheric mercury to the urban and rural sites
were determined using Concentration Field Analysis, in which atmospheric
mercury measurements were combined with back trajectory data to
determine source regions. Only some source regions correlated to mercury emission
sources listed in the Federal Pollutant Release and Transfer Register,
leaving the rest unaccounted for. Contributions of anthropogenic mercury
point sources in and around Mexico City to concentration averages measured
at the urban site during the study were estimated to be: 93±3% of
reactive mercury (PHg and RGM), and; 81±0.4% of GEM. Point source
contributions to GEM measured at the rural site were 72±1%. GEM
and reactive mercury (PHg+RGM) were not found to correlate with biomass
burning at either of the measurement sites. |
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