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• W2052293180 endingPage "585" @default.
• W2052293180 startingPage "578" @default.
• W2052293180 abstract "Methyl-mercury (CH3Hg+) production was studied in freshwaters from lake Moreno, an ultraoligotrophic system belonging to Northern Patagonia. Hg2+ labelled with high specific activity 197Hg was spiked to water samples in concentrations of 10 ng l(-1), and incubated in laboratory for 3d time trends under different conditions. Experimental water was sampled daily to evaluate CH3(197)Hg+ production. Lake water used in the experiments was sampled just below the upper limit of the metalimnion ( approximately 30 m depth), where maximum values of chlorophyll a have been measured previously. Sampling was performed in late autumn, when the plankton fraction <50 microm exhibited mercury concentrations up to 260 microg g(-1) dry weight. The experiments analysed lake water filtered through 50, 20, and 0.2 microm (filter-sterilized) mesh nets. ASTM grade 1 water was also incubated for control. All the experiments were run in an environmental chamber under controlled temperature and light regime. High Hg2+ conversion to CH3Hg+, up to 50%, was measured in lake water, in a process stimulated by light. CH3Hg+ production was two-fold higher after 3d of incubation with illumination compared to total darkness. Sterile lake water showed conversions up to 30%, while the planktonic components seem to enhance the CH3Hg+ production. Overall, our results provide evidence that lake Moreno waters favour CH3Hg+ production in processes stimulated by light. Although biotic components certainly contribute to enhance mercury methylation, water chemistry plays a key role in this process. We hypothesize that dissolved organic matter, particularly its quality, could be decisive." @default.
• W2052293180 created "2016-06-24" @default.
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• W2052293180 date "2008-06-01" @default.
• W2052293180 modified "2023-10-09" @default.
• W2052293180 title "Methylmercury production in the water column of an ultraoligotrophic lake of Northern Patagonia, Argentina" @default.
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• W2052293180 doi "https://doi.org/10.1016/j.chemosphere.2008.03.011" @default.
• W2052293180 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18440585" @default.
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