title: Availability and persistence of isoproturon under field and laboratory conditions.
abstract: Field and laboratory tests were conducted to investigate the disappearance and decrease in availability of the herbicide isoproturon in soil with time. Monitoring the fate of 14C-labeled isoproturon gave the persistence of the herbicide under different conditions. The calculated half-life (DT50) of the extractable parent product was close to 19 days for the two experiments, whereas half-lives of exhaustive extractable 14C-residues averaged 22 days under controlled conditions versus 48 days in the field. Moreover, if nonextractable 14C-residues were taken into account in estimating isoproturon fate, the DT50 of radioactive residues in soil (extractable parent and degradation products + nonextractable residues) reached 1 to 1.4 years under field and controlled conditions, respectively. The variability of disappearance rates for the different kinds of residues is discussed within a wider definition of persistence.
authors.affiliation: INPL-ENSAIA/CNRS-CPB, Vandoeuvre-lès-Nancy, 54505, France.
authors.forename: C
authors.initials: C
authors.lastname: Perrin-Ganier
authors.forename: C
authors.initials: C
authors.lastname: Breuzin
authors.forename: J M
authors.initials: JM
authors.lastname: Portal
authors.forename: M
authors.initials: M
authors.lastname: Schiavon
mesh_terms: D001673:Biodegradation, Environmental; D002250:Carbon Radioisotopes; D002851:Chromatography, High Pressure Liquid; D006207:Half-Life; D006540:Herbicides / Q000378:metabolism*; D007553:Isotope Labeling; D007700:Kinetics; D000432:Methanol / Q000737:chemistry; D008782:Methylurea Compounds / Q000378:metabolism*; D010573:Pesticide Residues / Q000032:analysis / Q000378:metabolism*; D010671:Phenylurea Compounds; D012989:Soil Pollutants / Q000378:metabolism*
chemical_list: D002250:Carbon Radioisotopes; D006540:Herbicides; D008782:Methylurea Compounds; D010573:Pesticide Residues; D010671:Phenylurea Compounds; D012989:Soil Pollutants; C028904:isoproturon; D000432:Methanol