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Environmental Health - Toxic Substances


Herbicides and other Agricultural Chemicals -- Midwest Cornbelt [Completed]

Graph showing the instantaneous load in ounces per second for 4 herbicides.
Concentrations of herbicides in flood waters from the 1998 flood of the Nishnabotna River in southwestern Iowa. The highest herbicide concentration was 5.06 micrograms per liter (µg/L) for atrazine (Kolpin and others, 2000).

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The occurrence, transport, and fate of agricultural chemicals is being studied in a 12-State area in the upper Midwest. Scientists are identifying factors that affect dispersal of these chemicals in surface and ground waters from point of application and are evaluating the resulting effects in small streams and large rivers, at reservoir outfalls, in shallow ground water, and in precipitation. The goal is to provide the general scientific basis needed to develop agricultural management practices that protect the quality of the region's water resources.

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