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Environmental Health - Toxic Substances

Research Projects

Pesticide Contamination in Varied Pesticide-Use Settings

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 (g/L) for atrazine (Kolpin and others, 2000)
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 (g/L) for atrazine (Kolpin and others, 2000) -- from the Agricultural Chemicals in the Upper Midwest Project

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New pesticides are developed continually, and increasingly, degradation byproducts of legacy and current-use pesticides are discovered. Information on the environmental occurrence of these chemicals is needed to evaluate their potential environmental and human health significance. This project activity has two-fold objectives: (1) develop methods to measure new pesticides and their byproducts in samples of various environmental media at concentrations relevant to assessing their persistence, transport, and fate; and (2) gather information on the environmental occurrence of these chemicals in sensitive and/or susceptible ecosystems near areas of common use of the pesticide, such as areas of similar land use, crop types, and/or farming practices. Pesticide-use studies in selected settings include:

Herbicides and other Agricultural Chemicals -- Midwest Cornbelt

Cotton Agriculture -- Southern United States

Agricultural Chemicals in Ground Water -- Plains, Georgia [Completed]

Transport of Herbicides in Streams and Shallow Ground Water , Cedar River, Iowa [Completed]

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