title: Long-term persistence of various 14C-labeled pesticides in soils.
abstract: The fate of the 14C-labeled herbicides ethidimuron (ETD), methabenzthiazuron (MBT), and the fungicide anilazine (ANI) in soils was evaluated after long-term aging (9-17 years) in field based lysimeters subject to crop rotation. Analysis of residual 14C activity in the soils revealed 19% (ETD soil; 0-10 cm depth), 35% (MBT soil; 0-30), and 43% (ANI soil; 0-30) of the total initially applied. Accelerated solvent extraction yielded 90% (ETD soil), 26% (MBT soil), and 41% (ANI soil) of residual pesticide 14C activity in the samples. LC-MS/MS analysis revealed the parent compounds ETD and MBT, accounting for 3% and 2% of applied active ingredient in the soil layer, as well as dihydroxy-anilazine as the primary ANI metabolite. The results for ETD and MBT were matching with values obtained from samples of a 12 year old field plot experiment. The data demonstrate the long-term persistence of these pesticides in soils based on outdoor trials.
authors.affiliation: Institute of Bio- and Geosciences, IBG-2-Plant Sciences, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany. n.d.jablonowski@fz-juelich.de
authors.forename: Nicolai D
authors.initials: ND
authors.lastname: Jablonowski
authors.forename: Andreas
authors.initials: A
authors.lastname: Linden
authors.forename: Stephan
authors.initials: S
authors.lastname: Köppchen
authors.forename: Björn
authors.initials: B
authors.lastname: Thiele
authors.forename: Diana
authors.initials: D
authors.lastname: Hofmann
authors.forename: Werner
authors.initials: W
authors.lastname: Mittelstaedt
authors.forename: Thomas
authors.initials: T
authors.lastname: Pütz
authors.forename: Peter
authors.initials: P
authors.lastname: Burauel
mesh_terms: D052160:Benzothiazoles / Q000032:analysis; D002250:Carbon Radioisotopes; D004784:Environmental Monitoring; D005659:Fungicides, Industrial / Q000032:analysis*; D006540:Herbicides / Q000032:analysis*; D008782:Methylurea Compounds / Q000032:analysis; D008956:Models, Chemical; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D014227:Triazines / Q000032:analysis
chemical_list: D052160:Benzothiazoles; D002250:Carbon Radioisotopes; D005659:Fungicides, Industrial; D006540:Herbicides; D008782:Methylurea Compounds; D012987:Soil; D012989:Soil Pollutants; D014227:Triazines; C514786:ethidimuron; C011912:methabenzthiazuron; C004855:dyrene