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Triclosan and triclosan-derived dioxins in the Mississippi River sediment record

This project is focused on establishing whether triclosan has been and continues to be a source of dioxins to the aquatic environment. It is hypothesized that triclosan, a widely used antimicrobial found in consumer products, is transformed into toxic dioxin compounds through chlorination of triclosan-containing wastewater and sunlight exposure in rivers that receive chlorinated wastewater. It is further hypothesized that triclosan and its products will associated with the sediment downstream of the point of discharge and their release to the environment thus will be recorded in the sediment record. To determine the historical inputs of triclosan and its products to the Upper Mississippi River from Minnesota's largest wastewater treatment plant, the Metro Plant in St. Paul, sediment cores from Lake Pepin will be analyzed. It is expected that triclosan and its products will not be found in pre-196 sediment, it will be at low levels between 196 and 199 when its use was limited, and will be at the highest levels after 199 following its widespread use in liquid handsoap and toothpaste. The results of this study will further our understanding of micropollutants in wastewater and will provide specific information about the appropriateness of chlorination disinfection for triclosan- containing waters. (Mississippi river); (triclosan); (dioxin); (dioxins); (chemicals of concern); (chemical of concern); (chemicals of emerging concern); (chemical of emerging concern); (wastewater); (toxic organic); (toxic organics); (organochloride); (organochlorides)

(Matching Funds) $53,573 USD (Estimates)

Status
In progress
Type
Project
Start Date
End Date
Researchers
Kristopher McNeillPrincipal Investigator
Associated with 3 projects
William ArnoldResearcher
Associated with 1 projects
Agencies
U.S. Geological Survey $ 27,187.00USDEstimates

Funding 13 projects for a total of $538,321.00
Scope of Study
Field Investigation
Scale of Phenomena
Landscape
Physical/Chemical
Impact of Pollutants
Toxic Organics
Processes
Natural Physical/Geological Processes
Treatment / Manufacturing Processes
State Province
Minnesota
Annex Numbers
Contaminated Sediment
Persistent Toxic Substances
Research & Development
Specific Objectives for toxic substances and effluents
Annex 17
Mass transfer of pollutants between GL Basin Ecosystem components
General
Annex
  • Annex Numbers
    Annex Numbers
    Contaminated Sediment
    Persistent Toxic Substances
    Research & Development
    Specific Objectives for toxic substances and effluents
  • Annex 17
    Annex 17
    Mass transfer of pollutants between GL Basin Ecosystem components

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