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Controls on the fate and transport of methylmercury in a boreal headwater catchment, northwestern Ontario, Canada

Name: Controls on the fate and transport of methylmercury in a boreal headwater catchment, northwestern Ontario, Canada
Keywords: [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.STU] Sciences of the Universe [physics]/Earth Sciences, [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment

appsOther research productkeyboard_double_arrow_right Other ORP type English Funded by:NSERC

Authors: Branfireun, B. A.; Roulet, N. T.;

Controls on the fate and transport of methylmercury in a boreal headwater catchment, northwestern Ontario, Canada

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  (25)

Abstract

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

Keywords

[SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.STU] Sciences of the Universe [physics]/Earth Sciences, [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment

25 references, page 1 of 3

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Benoit, J.M., Gilmour ,C.C. and Mason, R.P., 2001. Aspects of bioavailability of mercury for methylation in pure cultures of Desulfobulbus propionicus (1pr3). Appl. Environ. Microbiol., 67, 51-58.

Bloom, N.S. and Fitzgerald, W.F., 1988. Determination of volatile mercury species at the picogram level by low temperature gas chromatography with cold-vapor atomic fluorescence detection. Anal. Chim. Acta, 208, 151-161.

Branfireun, B.A.and Roulet, N.T.,1998. The baseflow and storm flow hydrology of a Precambrian Shield headwater peatland. Hydrol. Process., 12, 57-72.

Branfireun, B.A., Heyes, A. and Roulet, N.T., 1996. The hydrology and methylmercury dynamics of a Precambrian Shield headwater peatland. Water Resour. Res., 32, 1785-1974.

Branfireun, B.A., Hilbert, D. and Roulet, N.T., 1998. Sinks and sources of methylmercury in a boreal catchment. Biogeochem., 41, 277-291.

Branfireun, B.A., Roulet, N.T., Kelly, C. and Rudd, J.W.M., 1999. Sulphate stimulation of mercury methylation in a boreal peatland: Toward a link between acid rain and the mercury cycle. Global Biogeochem. Cycle, 13, 743-750.

Branfireun, B.A., Bishop, K., Roulet, N.T., Granberg, G. and Nilsson, M., 2001. Mercury cycling in boreal ecosystems: the long-term effect of acid rain constituents on peatland pore water methylmercury concentrations, Geophys. Res. Let., 28, 1227- 1230.

Devito, K.J., Waddington, M.J. and Branfireun, B.A., 1997. Flow reversals in peatlands influenced by local groundwater systems, Hydrol. Process., 11, 103-110.

Donahue, W.F., Schindler, D.W., Page, S.J. and Stainton, M.P., 1998. Acid-induced changes in DOC quality in an experimental whole-lake manipulation. Environ. Sci. Technol., 32, 2954- 2960.

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