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Herbicides and Herbicide Degradation Products in Upper Midwest Agricultural Streams during August Base-Flow Conditions

Stephen J. Kalkhoff*,a, Kathy E. Leea, Stephen D. Porterb, Paul J. Terrioc and E. Michael Thurmanc

a U.S. Geological Survey, 2280 Woodale Dr., Mounds View, MN 55112
b U.S. Geological Survey, Denver Federal Center, Box 25046, MS 406, Lakewood, CO 80225-0046
c U.S. Geological Survey, 4821 Quail Crest Pl., Lawrence, KS 66049



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  		Fig. 1. Sampling sites and predominant soil parent materials in the study area.

 


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  		Fig. 2. Relation between hydroxy-atrazine to atrazine ratio (HAR) and deethylatrazine plus deisoproplyatrazine to atrazine ratio (DDAR) and the latitude.

 


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  		Fig. 3. Frequency of detection and median concentration of selected herbicides and herbicide metabolites in streams draining till and windblown loess-derived soils of the upper U.S. Midwest, August 1997.

 


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  		Fig. 4. Concentrations of atrazine and metolachlor compounds in relation to rainfall during selected periods in the watershed during the growing season.

 




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