State Water Resources Research Institute Program

Project ID: 2009MN246B
Title: Reductive degradation of pesticides: Solid-state and solution-phase dynamics
Project Type: Research
Start Date: 3/01/2009
End Date: 2/28/2011
Congressional District: MN 05
Focus Categories: Toxic Substances, Geochemical Processes, Non Point Pollution
Keywords: pesticides, reduction, mineraology, iron oxides, groundwater
Principal Investigator: Arnold, William Alan (University of Minnesota); Penn, R Lee
Federal Funds: $ 0
Non-Federal Matching Funds: $ 45,856
Abstract: Ground water is contaminated by many human activities, including intentional and accidental releases of pesticides and leaching of pesticides from sites of application into subsurface soils. Many pesticides are amenable to degradation by way of abiotic reductive degradation, and many degradation reactions occur at the mineral-water interface. The objective of the present proposal is to quantify the changes in mineralogy of sediment samples caused by the reductive transformation of selected pesticides and to quantitatively link these solid-state changes to the evolving kinetics of contaminant degradation. Our central hypothesis is that natural sediments under reducing conditions that are repetitively (or continuously) exposed to oxidized contaminants will develop a pseudo-steady state reactivity. The goal will be accomplished through a combination of batch and column experiments in which the kinetics of pesticide reduction are quantified and changes in mineralogy are quantified using a variety of solid-state characterization techniques. Quantifying this pseudo-steady state reactivity will enable us to determine the potential for long-term contaminant attenuation. Results of this work will be of interest to scientists and regulators at both the state and federal level.

Progress/Completion Report, 2009, PDF
Progress/Completion Report, 2010, PDF

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