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Environmental Health - Toxic Substances


U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993, Water-Resources Investigations Report 94-4015

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Atrazine Transport Through Preferential Pathways

at the Missouri MSEA


James A. Tindall (U.S. Geological Survey, NRP, Denver, Colo.) and William K. Vencill (Department of Agronomy, University of Georgia, Athens, Ga.)


Results of experiments at the Missouri Management System Evaluation Area (MSEA) indicate that atrazine moved rapidly through the soil, probably due to the presence of a large number of cracks and macropores. Data also show that concentrations of atrazine exceeding 0.50 µg mL-1 were observed with depth (45-135 cm) after several months following heavy recharge events. It appears that macropores were a major factor in atrazine transport at the site. Agriculture practices designed to reduce surface cracking (which will reduce access to macropores) and chemical input could play a major role in lessening contamination of ground water in the Midwest.

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