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Mercury in the Salt Lake Valley

Mercury in the Salt Lake Valley. It’s kind of a big deal. February 19, 2005. What is known?. USGS, 2000. USGS, 1997. Spatial Variability of Mercury Methylation.

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Mercury in the Salt Lake Valley

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  1. Mercury in the Salt Lake Valley • It’s kind of a big deal February 19, 2005

  2. What is known? USGS, 2000 USGS, 1997

  3. Spatial Variability of Mercury Methylation

  4. “New approaches are necessary to better elucidate, track, and quantify Hg sources and transformations in the environment” (Bergquist and Blum); especially methylmercury. • Mercury exhibits both mass dependent and mass independent fractionation in ecological pathways though photoreduction is the only mechanism that exhibited significant mass independent fractionation (MIF in MeHg is more pronounced than iHg during photoreduction experiments). • Degree of MIF is greater in large dissolved organic carbon (DOC) conditions • Fractionation may be dependent on the type of DOC (GSL and wetland sediments) Isotopic Signatures

  5. Brine shrimp have been found to have elevated levels of Hg in summer/fall (Naftz, 2008) • Eared grebes Hg concentration increased three-fold over the fall molting period (Naftz, 2008) • Many duck species have exceeded EPA limits (.3 mg/kg Hg dry weight) (Peterson, 2008) • What about other organisms/plants? Affect to organisms

  6. Extension: Mercury in Ecuador Figure from Greg Carling Image from Greg Carling

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