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Degradation of an Atrazine and Metolachlor Herbicide Mixture in Pesticide-Contaminated Soils from Two Agrochemical Dealerships in Iowa |
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| Authors: | Arthur Ellen L Perkovich Brenda S Anderson Todd A Coats Joel R |
| Institution: | 1. Bayer Corporation, 17745 South Metcalf, ACR II, Stilwell, KS, 66085, USA 2. ECR Inc., 2327 Englert Drive, Suite 100, Durham, NC, 27713, USA 3. The Institute of Environmental and Human Health (TIEHH), Lubbock, TX, 79416, USA 4. Department of Entomology, Iowa State University, Ames, Iowa, 50011, USA |
| Abstract: | The fate of atrazine and metolachlor,applied as a mixture, in soil taken from twopesticide-contaminated sites in Iowa (denoted as Alphaor Bravo) were determined in laboratory studies. Atrazine and metolachlor degradation, as well asatrazine mineralization, were greater in soilcollected from Kochia scoparia L. (Schrader)rhizosphere than in soils from unvegetated areas. Theradiolabeled 14C-carbinol and14C-morpholinone metabolites were identified in14C-metolachlor-applied soil 60 d aftertreatment. The half-life for atrazine in Alpha soilwas significantly less in the rhizosphere soil (50 d)than in unvegetated soil (193 d). Quantities ofspecific atrazine degraders were one to two orders ofmagnitude greater in Bravo soils than in Alpha soils. In an experiment with plants present, significantlymore 14C-atrazine was taken up by K.scoparia (9.9% of the applied 14C) than by Brassica napus L. Significantly less atrazine wasextractable from soils vegetated with K.scoparia than from soils vegetated with B.napus or unvegetated soils. |
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