IngentaConnect Degradation of an Atrazine and Metolachlor Herbicide Mixture in P...

Authors: Arthur E.L.¹; Perkovich B.S.²; Anderson T.A.³; Coats J.R.⁴

Source: Water, Air, and Soil Pollution, Volume 119, Numbers 1-4, April 2000 , pp. 75-90(16)

Publisher: Springer

Abstract:

The fate of atrazine and metolachlor, applied as a mixture, in soil taken from two pesticide-contaminated sites in Iowa (denoted as Alpha or Bravo) were determined in laboratory studies. Atrazine and metolachlor degradation, as well as atrazine mineralization, were greater in soil collected from Kochia scoparia L. (Schrader) rhizosphere than in soils from unvegetated areas. The radiolabeled ^14C-carbinol and^14C-morpholinone metabolites were identified in^14C-metolachlor-applied soil 60 d after treatment. The half-life for atrazine in Alpha soil was significantly less in the rhizosphere soil (50 d) than in unvegetated soil (193 d). Quantities of specific atrazine degraders were one to two orders of magnitude greater in Bravo soils than in Alpha soils. In an experiment with plants present, significantly more ^14C-atrazine was taken up by K. scoparia (9.9% of the applied ^14C) than by Brassica napus L. Significantly less atrazine was extractable from soils vegetated with K. scoparia than from soils vegetated with B. napus or unvegetated soils.

Keywords: bioremediation; microbial degradation; microorganisms; pesticide contamination; phytoremediation

Language: English

Document Type: Regular paper

Affiliations: 1: Bayer Corporation, 17745 South Metcalf, ACR II, Stilwell, KS 66085, U.S.A.; (author for correspondence, e-mail: ellen.arthur.b@bayer.com) 2: ECR Inc., 2327 Englert Drive, Suite 100, Durham, NC 27713, U.S.A. 3: The Institute of Environmental and Human Health (TIEHH), Lubbock, TX 79416, U.S.A. 4: Department of Entomology, Iowa State University, Ames, Iowa 50011, U.S.A.

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Degradation of an Atrazine and Metolachlor Herbicide Mixture in Pesticide-Contaminated Soils from Two Agrochemical Dealerships in Iowa