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Identification of sites of methyl mercury (MeHg) production is critical to predicting long-term fate of bioaccumulative Hg in the aquatic environment. During baseflow, when groundwater sources dominate, we observed consistently elevated levels of MeHg (0.1–0.4 ng L −1 ) at the mouth and in several tributaries to the Tahquamenon River in the Lake Superior watershed. MeHg concentrations in groundwater...
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