A model for the formation and degradation of bound residues of the herbicide 14C-isoproturon in soil.
Chemosphere
; 39(4): 627-39, 1999 Aug.
Article
in En
| MEDLINE
| ID: mdl-10422252
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-4-isoproturon and free 14C-4-isopropylaniline in the same soil.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Phenylurea Compounds
/
Soil Pollutants
/
Pesticide Residues
/
Herbicides
/
Methylurea Compounds
Language:
En
Journal:
Chemosphere
Year:
1999
Document type:
Article
Affiliation country: