A model for the formation and degradation of bound residues of the herbicide 14C-isoproturon in soil

S. Reuter, M. Ilim, J. C. Munch, F. Andreux, I. Scheunert

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The humic monomer catechol was reacted with 14C-isoproturon and some of its metabolites, including 14C-4-isopropylaniline, in aqueous solution under a stream of oxygen. Only in the case of 14C-4-isopropylaniline, incorporation in oligomers, in fulvic acid-like polymers, and in humic acid-like polymers was observed. The main oligomer was identified by mass spectrometry as 4,5-bis-(4-isopropylphenylamino)-3,5-cyclohexadiene-1,2-dione. Oligomers and polymers containing bound 14C-4-isopropylaniline were subjected to biodegradation studies in a loamy agricultural soil during 55 days by quantifying 14CO2 evolved. In all cases, significant mineralization rates could be determined, which, however, were much smaller than those of free 14C-isoproturon and free 14C-4-isopropylaniline in the same soil.

Original languageEnglish
Pages (from-to)627-639
Number of pages13
JournalChemosphere
Volume39
Issue number4
DOIs
StatePublished - Aug 1999
Externally publishedYes

Keywords

  • 4-Isopropylaniline
  • Biodegradation
  • Bound residues
  • Catechol
  • Humic substances
  • Isoproturon
  • Phenylurea herbicide
  • Quinone

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