Specific rates of net methylmercury production in lake sediments |
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Authors: | T Matilainen M Verta M Niemi A Uusi-Rauva |
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Institution: | 1. Department of Limnology, University of Helsinki, Viikki, E-house, SF-00710, Helsinki, Finland 2. Water and Environment Research Institute, National Board of Waters and the Environment, P.O.Box 250, SF-00101, Helsinki, Finland 3. Faculty of Agriculture and Forestry, Instrument Centre, University of Helsinki, SF-00710, Helsinki, Finland
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Abstract: | Specific rates of Hg (203HgCl2) methylation and McHg (14CH3HgI) demethylation in aerobic and anaerobic conditions were determined in samples of surface sediments (0 to 2 cm) taken from
five small headwater lakes in Southern Finland. The highest rates of methylation were measured in anaerobic conditions. However,
the importance of aerobic methylation increased with increasing Fe and Mn content in sediment. There was little difference
between aerobic and anaerobic demethylation. The results demonstrate that the net McHg production in lake sediments depends
on the individual characteristics of the lake, particularly pH and and sediment properties. These characteristics seem to
affect demethylation in anaerobic conditions and methylation in aerobic conditions. |
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