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| Titel |
Controls on the fate and transport of methylmercury in a boreal headwater catchment, northwestern Ontario, Canada |
| VerfasserIn |
B. A. Branfireun, N. T. Roulet |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 6, no. 4 ; Nr. 6, no. 4, S.785-794 |
| Datensatznummer |
250003674
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| Publikation (Nr.) |
 copernicus.org/hess-6-785-2002.pdf |
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| Zusammenfassung |
| The fate and transport of
methylmercury (MeHg) were studied in a small boreal catchment. Hydrological
processes largely govern the magnitude of the flux of MeHg. Seasonal and
inter-annual variability in hydrology produce variable source strengths of MeHg
throughout the catchment. The mass flux of MeHg within, and from the catchment
is dependent on the mass flux of water and the relative placement of landscape
units in the catchment hydrological cascade. Hydrology also governs the
maintenance of the methylating environments in the catchment. Specifically,
hydrological processes maintain zones of anoxia in both the catchment uplands
and peatlands that support obligate anaerobic sulphate-reducing bacteria. In
addition, groundwater flow paths are an essential control on the delivery of
sulphate to these bacteria that facilitate in situ mercury methylation.
Keywords: methylmercury, methylation, hydrology, boreal
catchment, peatland, Ontario, Canada |
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