State Water Resources Research Institute Program

Project Id: 2010WA308B
Title: Water Quality Parameters Controlling the Photodegradation of Herbicides in Surface Waters in the Columbia Basin, Washington
Project Type: Research
Start Date: 3/01/2010
End Date: 2/28/2011
Congressional District: Washington-District 5
Focus Categories: Toxic Substances, Surface Water, Treatment
Keywords: Herbicides, photolysis, surface waters, water quality parameters
Principal Investigators: Furman, Olha (Washington State University); Rentz, Jeremy (Washington State University); Ullman, Jeffrey Layton ; Watts, Rick
Federal Funds: $ 28,000
Non-Federal Matching Funds: $ 56,109
Abstract: Pesticides are applied to crop lands at various times throughout the year. Although the benefits of pesticide use are undisputed, runoff of these xenobiotics into surface water can result in threats to public health and aquatic organisms. Pesticide transformation processes include abiotic oxidation and reduction, hydrolysis, photolysis, and biodegradation. Photolysis of pesticides is one of the primary transformation pathways in the surface waters. Atrazine and 2,4-D are the most frequently detected herbicides in surface waters in the Central Columbia Basin of Washington State. The proposed research will elucidate which of three water quality parameters (nitrate-nitrogen concentration, dissolved organic matter, and transition metal oxide concentrations) control the photolysis rate of atrazine and 2,4-D in the surface waters of the Columbia Basin. The rationale of this study is that a fundamental understanding of herbicide transformation will provide a foundation to predict herbicide fate in the Columbia Basin, and provide the potential to manage irrigation runoff to maximize rates of photolysis in surface waters.

Progress/Completion Report, 2010, PDF

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