Atrazine in a Stream-Aquifer System: Transport of Atrazine and Its Environmental Impact Near Ashland, Nebraska |
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| Authors: | Darryl A Blum James D Carr Ralph K Davis Darryll T Pederson |
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| Institution: | Darryl A. Blum earned his M.S. in analytical chemistry in 1992 at the University of Nebraska, and is a Ph.D. graduate student in the Department of Chemistry (227 Hamilton Hall, University of Nebraska, Lincoln, NE 68588).;James D. Carr earned his Ph.D. in analytical chemistry in 1966 at Purdue University, and is professor in the University of Nebraska Department of Chemistry (227 Hamilton Hall, University of Nebraska, Lincoln, NE 68588).;Ralph K. Davis earned his Ph.D. in hydrogeology in 1992 at the University of Nebraska, and is an assistant professor in the Department of Earth Sciences and Physics at the University of South Dakota (414 E. Clarke St., University of South Dakota, Vermillion, SD 57069).;Darryll T. Pederson earned his Ph.D. in 1971 at the University of North Dakota, and is a professor in the University of Nebraska Department of Geology and research hydrogeologist in the Conservation and Survey Division (304 Bessey Hall, University of Nebraska, Lincoln, NE 68588). |
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| Abstract: | Lincoln's municipal wellfield consists of 44 wells located adjacent to the Platte River near Ashland, Nebraska. The herbicide atrazine was monitored in the river and two transects of monitoring, wells. The amount of atrazine transported down the Platte River in 1989, 1990, and 1991 was shown to increase each year. Induced recharge from the Platte River results in movement of atrazine from the river into the aquifer. A 21-day lag time was determined for the movement of atrazine from the river to a transect of monitoring wells 10 feet West of the bank. The role that colloids play on the transport of atrazine was determined to be insignificant. A small percentage of atrazine found in the river was determined to come from rain water. The infiltration of agrichemical-contaminated river water was shown to significantly reduce the quality of raw water and finished water being produced by the adjacent aquifer. |
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