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Environ Sci Pollut Res Int

Title:		Biogeochemical controls on mercury methylation in the Allequash Creek wetland
Author(s):		Creswell JE; Shafer MM; Babiarz CL; Tan SZ; Musinsky AL; Schott TH; Roden EE; Armstrong DE;
Address:		"Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 N. Park St, Madison, WI, 53706, USA. joel.creswell@mail.house.gov. U.S. House of Representatives, 2346 Rayburn House Office Building, Washington DC, 20515, USA. joel.creswell@mail.house.gov. Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 N. Park St, Madison, WI, 53706, USA. Wisconsin State Laboratory of Hygiene, 2601 Agriculture Dr, Madison, WI, 53718, USA. Wisconsin Water Science Center,U.S. Geological Survey, 8505 Research Way, Middleton, WI, 53562, USA. Department of Geoscience, University of Wisconsin - Madison, 1215 W. Dayton St, Madison, WI, 53706, USA"
Journal Title:		Environ Sci Pollut Res Int
Year:		2017
Volume:		20170513
Issue:		18
Page Number:		15325 - 15339
DOI:		10.1007/s11356-017-9094-2
ISSN/ISBN:		1614-7499 (Electronic) 0944-1344 (Linking)
Abstract:		"We measured mercury methylation potentials and a suite of related biogeochemical parameters in sediment cores and porewater from two geochemically distinct sites in the Allequash Creek wetland, northern Wisconsin, USA. We found a high degree of spatial variability in the methylation rate potentials but no significant differences between the two sites. We identified the primary geochemical factors controlling net methylmercury production at this site to be acid-volatile sulfide, dissolved organic carbon, total dissolved iron, and porewater iron(II). Season and demethylation rates also appear to regulate net methylmercury production. Our equilibrium speciation modeling demonstrated that sulfide likely regulated methylation rates by controlling the speciation of inorganic mercury and therefore its bioavailability to methylating bacteria. We found that no individual geochemical parameter could explain a significant amount of the observed variability in mercury methylation rates, but we found significant multivariate relationships, supporting the widely held understanding that net methylmercury production is balance of several simultaneously occurring processes"
Keywords:		"Geologic Sediments Mercury/*chemistry *Methylation *Methylmercury Compounds Water Pollutants, Chemical/*chemistry Wetlands Bioavailability Biogeochemistry Hyporheic zone Mercury Methylation Speciation Wetland;"
Notes:		"MedlineCreswell, Joel E Shafer, Martin M Babiarz, Christopher L Tan, Sue-Zanne Musinsky, Abbey L Schott, Trevor H Roden, Eric E Armstrong, David E eng Germany 2017/05/16 Environ Sci Pollut Res Int. 2017 Jun; 24(18):15325-15339. doi: 10.1007/s11356-017-9094-2. Epub 2017 May 13"