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Atrazine Hydrolysis in Soil¹

ABSTRACT

An important pathway of atrazine degradation in perfusion systems of three soils was chemical hydrolysis to hydroxyatrazine. Ultraviolet spectrophotometric analyses of the perfusates showed the presence and accumulation of hydroxyatrazine. Atrazine degradation followed first-order kinetics in soil-free, sterilized soil and perfusion systems. An increased rate of atrazine hydrolysis in an acid soil was consistent with the effect of pH on hydrolysis. No microbial degradation of atrazine was detected following inoculation of a soil-free atrazine medium with perfusates. An increased rate of hydrolysis in the presence of sterilized soil was postulated to result from soil adsorption of atrazine. Soil pH and organic matter content largely controlled the rate of atrazine hydrolysis; for soils of similar pH, atrazine degradation rates increased with increased atrazine adsorption.

¹ Contribution from the Department of Soils, Univ. of Wisconsin, Madison. Published with the approval of the Director. Wisconsin Agr Exp. Sta. This investigation was supported in, part by PHS research grant No. WP-00751 from The Water Polution Division, Public Health Service. Presented before Div, S-3, Soil Science Society of America, Nov. 1, 1965, at Columbus, Ohio.

² Project Associate, Associate Professor, and Assistant Professor of Soils, respectively.

Received for publication June 13, 1966. Accepted for publication October 18, 1966.