1. Spatial variation in methylation rates in Farmington and Ogden Bays Ms. Abigail Rudd, Dr. Diego Fernandez, Mr. Greg Carling, Prof. William Johnson University of Utah, Geology & Geophysics Funded by Forestry, Fire, and State Lands

3. 1200 16002000 020006001200 Selenium & Mercury at Ambassador Duck Club Greg Carling University of Utah

4. Howard Slough outfall July 23-24, 2008 Ambassador W-1 outlet August 20-21, 2008 (Howard Slough data from David Naftz) methyl Hg (ng/L)

5. (from USGS Fact Sheet 146-00) Complex processes controlling methyl Hg

7. Measuring Hg methylation

11. Total Hg Methyl Hg Total Hg Methyl Hg Hg 2+ spike Initial sample Spike Later sample  MeHg = 30% Extraction efficiency not consistent enough to reliably measure  MeHg

12. 204 Total Hg Methyl Hg 202 Total Hg Methyl Hg 204 Hg 2+ spike  Me 204 Hg  Me 204 Hg is 300% Can reliably measure Initial sample Spike Later sample

15. Summer

18. Spatial variability occurs for methyl Hg concentrations and Hg methylation potentials Methyl Hg and total Hg concentrations do not correspond to methylation rates Initial results tie Hg methylation rates to organic matter content Summary