Global ETD Search

1	Mercury Isotope Fractionation during Aqueous Photo-reduction of Methylmercury in Presence of Different Types and Amounts of Dissolved Organic Matter Chandan, Priyanka 06 December 2011 (has links) The effects of different types and amounts of dissolved organic matter (DOM) on the isotope fractionation of Hg isotopes during aqueous photo-reduction of monomethylmercury (MMHg) were investigated to assess whether mass-independent fractionation (MIF) signatures can be used to track photo-degradation of MMHg in natural waters. From experiments conducted with different amounts of reduced organic sulfur (Sred-DOM), it appears that MIF during photo-reduction may be dependent on whether MMHg is dominantly bound to Sred-DOM. Similar fractionation factors were observed for experiments where Sred-DOM was in far excess of MMHg, while significantly lower fractionation factors were observed with lower Sred-DOM. We also characterized the signature of MIF (i.e. Δ199Hg/Δ201Hg) during MMHg photo-degradation to assess if it was similar in different matrices. The experimental Δ199Hg/Δ201Hg was very similar for different matrices. However, the experimental slope is slightly but statistically different than the slope observed in freshwater fish, which preserve MMHg in nature. Methylmercury Dissolved organic matter mass-independent fractionation Mercury Isotopes MMHg photo-degradation 0372
2	Mercury Isotope Fractionation during Aqueous Photo-reduction of Methylmercury in Presence of Different Types and Amounts of Dissolved Organic Matter Chandan, Priyanka 06 December 2011 (has links) The effects of different types and amounts of dissolved organic matter (DOM) on the isotope fractionation of Hg isotopes during aqueous photo-reduction of monomethylmercury (MMHg) were investigated to assess whether mass-independent fractionation (MIF) signatures can be used to track photo-degradation of MMHg in natural waters. From experiments conducted with different amounts of reduced organic sulfur (Sred-DOM), it appears that MIF during photo-reduction may be dependent on whether MMHg is dominantly bound to Sred-DOM. Similar fractionation factors were observed for experiments where Sred-DOM was in far excess of MMHg, while significantly lower fractionation factors were observed with lower Sred-DOM. We also characterized the signature of MIF (i.e. Δ199Hg/Δ201Hg) during MMHg photo-degradation to assess if it was similar in different matrices. The experimental Δ199Hg/Δ201Hg was very similar for different matrices. However, the experimental slope is slightly but statistically different than the slope observed in freshwater fish, which preserve MMHg in nature. Methylmercury Dissolved organic matter mass-independent fractionation Mercury Isotopes MMHg photo-degradation 0372
3	Geochemical and Microbiological Controls on Mercury Methylation in Natural Waters Agather, Alison M. January 2018 (has links) No description available. Biogeochemistry Environmental Science Limnology Oceanography Monomethylmercury MMHg Mercury Methylation Hg methylation
4	In situ measurement of mercury ecotoxicological effects on stream periphyton in southwest Ohio Klaus, Jaclyn Elizabeth 05 September 2014 (has links) No description available. Biology Aquatic Sciences Chemistry Environmental Science Periphyton MMHg monomethylmercury ecotoxicology primary producer metabolic activity biomass toxicity sediment biofilm in situ

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