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Reduction of Agricultural Pesticides in the Sediments of a Coastal Great Lakes Wetland

Objectives:  1) Determine the potential for sediments and associated porewaters to abiotically degrade pesticides; 2) Identify the responsible reductants that catalyze these reactions; 3) Determine the rates of pesticide degradation for a given set of redox parameters; 4) Identify and determine the products from these reactions.; and 5) Model the results in a manner that will allow coastal zone managers (CZMs) to best exploit this process for managing water quality in Lake Erie.  Rationale:  Wetlands may provide a means of managing nonpoint source pollution since water from diffuse sources can collect in wetland basins before final discharge. While some pollutants will be degraded by sunlight (see RP/S-22 and 29) and by microbial pathways in the water column, others will be sequestered in sediments. These sediments may have very active chemical constituents that can potentially degrade these pesticides. Thus, the questions that need to be asked are: 1) Which pesticides are susceptible to such degradative pathways? 2) How quickly can these pesticides breakdown? 3) What are the responsible natural reductants in sediments? and 4) What products are formed from such processes? By supporting this research we will be able to delineate between those pesticides that will ultimately be degraded in coastal wetland sediments, and those that will simply accumulate and remain a threat for future generations.

Status
In progress
Type
Project
Start Date
End Date
Scope of Study
Laboratory Investigation
Scale of Phenomena
Physical/Chemical
Impact of Pollutants
Nutrients, Including Phosphorus
Toxic Metals
Land Use and Habitat
Wetlands
Lake Basin Connecting Channels
Lake Erie
State Province
Ohio
Annex Numbers
Contaminated Sediment
Hazardous Polluting Substances - lists
Persistent Toxic Substances
Research & Development
Specific Objectives for toxic substances and effluents
Surveillance and Monitoring
Annex 17
Relationship of contaminated sediments on ecosystem health
General
Annex
  • Annex Numbers
    Annex Numbers
    Contaminated Sediment
    Hazardous Polluting Substances - lists
    Persistent Toxic Substances
    Research & Development
    Specific Objectives for toxic substances and effluents
    Surveillance and Monitoring
  • Annex 17
    Annex 17
    Relationship of contaminated sediments on ecosystem health

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