title: Runoff of pesticides from rice fields in the Ile de Camargue (Rhône river delta, France): field study and modeling.
abstract: A field study on the runoff of pesticides was conducted during the cultivation period in 2004 on a hydraulically isolated rice farm of 120 ha surface with one central water outlet. Four pesticides were studied: Alphamethrin, MCPA, Oxadiazon, and Pretilachlor. Alphamethrin concentrations in runoff never exceeded 0.001 microg L(-1). The three other pesticides were found in concentrations between 5.2 and 28.2 microg L(-1) in the runoff water shortly after the application and decreased thereafter. The data for MCPA compared reasonably well with predictions by an analytical runoff model, accounting for volatilization, degradation, leaching to groundwater, and sorption to soil. The runoff model estimated that runoff accounted for as much as 18-42% of mass loss for MCPA. Less runoff is observed and predicted for Oxadiazon and Pretilachlor. It was concluded that runoff from rice paddies carries important loads of dissolved pesticides to the wetlands in the Ile de Camargue, and that the model can be used to predict this runoff.
authors.affiliation: Laboratoire Chimie et Environnement, Université de Provence, Marseille Cedex 3, France.
authors.forename: Laetitia
authors.initials: L
authors.lastname: Comoretto
authors.forename: Bruno
authors.initials: B
authors.lastname: Arfib
authors.forename: Romain
authors.initials: R
authors.lastname: Talva
authors.forename: Philippe
authors.initials: P
authors.lastname: Chauvelon
authors.forename: Marc
authors.initials: M
authors.lastname: Pichaud
authors.forename: Serge
authors.initials: S
authors.lastname: Chiron
authors.forename: Patrick
authors.initials: P
authors.lastname: Höhener
mesh_terms: D008456:2-Methyl-4-chlorophenoxyacetic Acid / Q000032:analysis; D000083:Acetanilides / Q000032:analysis; D000383:Agriculture; D004784:Environmental Monitoring / Q000379:methods*; D005602:France; D008962:Models, Theoretical; D012275:Oryza; D010069:Oxadiazoles / Q000032:analysis; D010573:Pesticide Residues / Q000032:analysis*; D011722:Pyrethrins / Q000032:analysis; D045483:Rivers; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000083:Acetanilides; D010069:Oxadiazoles; D010573:Pesticide Residues; D011722:Pyrethrins; D014874:Water Pollutants, Chemical; C017160:cypermethrin; C118050:pretilachlor; C012466:oxadiazon; D008456:2-Methyl-4-chlorophenoxyacetic Acid