title: Formation and release of residues of the 14C-labelled herbicide isoproturon and its metabolites bound in model polymers and in soil.
abstract: The humic monomer catechol was reacted with (14)C-isoproturon and some of its metabolites, including (14)C-4-isopropylaniline, in aqueous solution under a stream of oxygen. Only in the case of (14)C-4-isopropylaniline, incorporation in oligomers, in fulvic acid-like polymers, and in humic acid-like polymers by covalent bonds was observed. The main oligomer was identified by mass spectrometry as a trimer, 4,5-bis-(4-isopropylphenylamino)-3,5-cyclohexadiene-1,2-dione. Biomineralization of (14)C-compounds to (14)CO(2) in a loamy soil and release of (14)C from soil columns into percolate water decreased in the order: free isoproturon >free 4-isopropylaniline>fulvic acid-like polymers>trimer>humic acid-like polymers. In soil columns, a small but measurable migration of (14)C from polymers from upper to deeper soil layers could be detected; most of this (14)C was bound again in a non-extractable form. It is concluded that aniline-derived pesticides bound in soil by covalent binding may not be fully undegradable, nor fully immobile.
authors.affiliation: GSF-Institute of Soil Ecology, D-85764 Neuherberg, Germany. scheunert@gsf.de
authors.forename: I
authors.initials: I
authors.lastname: Scheunert
authors.forename: S
authors.initials: S
authors.lastname: Reuter