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- W313655701 abstract "High mercury concentrations in freshwater fish compose a serious environmental problem in Sweden and a threat to human health. Mercury is accumulated in the food chain as methylmercury which is a potential nervous toxin, especially harmful for prenatal life. Due to anthropogenic emissions, mercury concentration in the atmosphere has increased, which has led to faster deposition rates and a storage of mercury in forest soils. Inorganic mercury is transformed into methylmercury by sulphur reducing bacteria in anoxic environments like wetlands and lake sediment and enters aquatic systems by runoff. Lately studies have shown that catchments subject to forestry practices have had an increased methylmercury load in runoff compared to undisturbed catchments. In Balsjo, northern Sweden a project is started to study the impacts of forestry on mercury levels in three forested catchments. This study is part of the baseline assessment as a characterisation of the study area with respect to mercury occurrence. Methyland total mercury concentrations in soil pore water have been measured using isotope dilution, gas chromatography-inductively coupled plasma mass spectrometry. The results have been compared with results from other studies in Sweden and show very low concentrations in the Balsjo area which may be due to the way the sampling was carried out. There were no significant differences in pre-treatment conditions between the catchments. Methylmercury concentrations are not controlled by total mercury but rather by the potential for methylation within the catchment. The lack of relationship between methylmercury concentrations seen in soil and water shows that it is not a simple equilibrium but indicates that other factors are involved where the binding to organic material could be one." @default.
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- W313655701 date "2006-01-01" @default.
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- W313655701 title "Methylmercury in runoff from forested catchments: Characterisation of three catchments prior to logging" @default.
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