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 language | English |
---|---|
Pages (from-to) | 627-639 |
Number of pages | 13 |
Journal | Chemosphere |
Volume | 39 |
Issue number | 4 |
DOIs | |
State | Published - Aug 1999 |
Externally published | Yes |
Keywords
- 4-Isopropylaniline
- Biodegradation
- Bound residues
- Catechol
- Humic substances
- Isoproturon
- Phenylurea herbicide
- Quinone