Degradation of an atrazine and metolachlor herbicide mixture in pesticide-contaminated soils from two agrochemical dealerships in Iowa

Ellen L. Arthur, Brenda S. Perkovich, Todd A. Anderson, Joel R. Coats

Research output: Contribution to journalArticle

31 Scopus citations

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-metolachlorapplied 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.

Original languageEnglish
Pages (from-to)75-90
Number of pages16
JournalWater, Air, and Soil Pollution
Volume119
Issue number1-4
DOIs
StatePublished - 2000

Keywords

  • Bioremediation
  • Microbial degradation
  • Microorganisms
  • Pesticide contamination
  • Phytoremediation

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