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Sediment processes and mercury transport in a frozen freshwater fluvial lake (Lake St. Louis, QC, Canada) |
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| Authors: | João Canário Laurier Poissant Carlos Vale David Lean |
| Institution: | a IPIMAR/National Institute of Biological Resources, Av. Brasília, 1449-006 Lisboa, Portugal b Environment Canada, Science and Technology Branch, 105 Rue McGill, 7e étage (Youville), Montréal, Québec H2Y2E7, Canada c Acadia University, Department of Earth and Environmental Sciences, Room LL33 K.C, Irving Environmental Science Center, Wolfville, Nova Scotia B4P2R6, Canada d University of Ottawa, Department of Biology, 30 Marie Curie, Ottawa, Ontario K1N 6N5, Canada |
| Abstract: | An open-bottom and a closed-bottom mesocosm were developed to investigate the release of mercury from sediments to the water column in a frozen freshwater lake. The mesoscosms were deployed in a hole in the ice and particulate mercury (HgP) and total dissolved mercury (TDHg) were measured in sediments and in water column vertical profiles. In addition, dissolved gaseous mercury (DGM) in water and mercury water/airflux were quantified. Concentrations of TDHg, DGM, and mercury flux were all higher in the open-bottom mesocosm than in the closed-bottom mesocosm. In this paper we focus on the molecular diffusion of mercury from the sediment in comparison with the TDHg accumulation in the water column. We conclude that the molecular diffusion and sediment resuspension play a minor role in mercury release from sediments suggesting that solute release during ebullition is an important transport process for mercury in the lake. |
| Keywords: | Mercury Mesocosm Sediment Diffusion Lake St Louis Canada |
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