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Controls on Methylation of Groundwater Hg(II) in Hyporheic Zones of Wetlands

This project addresses the groundwater-related problem of methyl   mercury (MeHg) formation in hyporheic zones. Groundwater transport   of inorganic mercury, Hg(II), to hyporheic zones leads to bacterial   transformation to MeHg and subsequent accumulation of the highly   toxic MeHg in aquatic foodwebs. The Objective is to determine the   main factors controlling the bioavailability of inorganic Hg(II) for   production of MeHg in wetland hyporheic zones. Formation of MeHg,   mainly by sulfate-reducing bacteria (SRB), is expected to depend on   the activity of SRB and the concentration and speciation of Hg(II).    This project's plan is to use a combination of field measurements   and laboratory experiments to resolve the main factors controlling   production of MeHg in hyporheic zones. In Field research at   hyporheic sites in the Allequash Creek wetland, concurrent   measurements of Hg(II) methylation rates, sediment pore-water   chemistry, and microbial activity will be used to test the   hypothesis that rates of Hg(II) methylation are dependent on both   concentration and speciation of Hg(II) and microbial activity in   hyporheic zones. In Laboratory Microcosm Experiments, sediments from   hyporheic zones will be incubated in microcosms under different   conditions to probe specific drivers of bioavailability. Response   measures will include methylation potential and other indicators of   Hg(II) bioavailability.     (groundwater); (methylmercury); (Hg); (mercury); (chemicals of   concern); (chemical of concern); (methylation); (foodweb);   (foodwebs); (aquatic foodweb); (aquatic foodwebs); (toxic metal);   (toxic metals); (sediment); (sediments)

Status
In progress
Type
Project
Start Date
End Date
Researchers
Martin ShaferPrincipal Investigator
Associated with 1 projects
David ArmstrongResearcher
Associated with 1 projects
Christopher BabiarzResearcher
Associated with 1 projects
Eric RodenResearcher
Associated with 1 projects
Agencies

Funding 1 projects for a total of $38,134.00
Scope of Study
Field Investigation
Laboratory Investigation
Scale of Phenomena
Biochemical
Ecosystem
Physical/Chemical
Impact of Pollutants
Toxic Metals
Processes
Natural Ecological Processes
Land Use and Habitat
Wetlands
State Province
Wisconsin
Region Being Monitored
Coastal Wetlands
Annex Numbers
Contaminated Sediment
Persistent Toxic Substances
Pollution from Contaminated Groundwater
Pollution from Non-Point Sources
Research & Development
Specific Objectives for toxic substances and effluents
Annex 17
Physical and transformational processes affecting delivery of pollutants
General
Annex
  • Annex Numbers
    Annex Numbers
    Contaminated Sediment
    Persistent Toxic Substances
    Pollution from Contaminated Groundwater
    Pollution from Non-Point Sources
    Research & Development
    Specific Objectives for toxic substances and effluents
  • Annex 17
    Annex 17
    Physical and transformational processes affecting delivery of pollutants

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