Dynamics of fipronil in Oleo Lagoon in Jataí Ecological Station, São Paulo-Brazil.
Fipronil is a phenylpyrazole pesticide widely used to protect sugar-cane crops from insect pests. After reaching the environment, this insecticide may have several fates. This research aimed to propose a kinetic model to describe the fate of commercial fipronil Regent 800WG in the sediment-water interface of the Oleo Lagoon in the Mogi-Guaçu river floodplain, situated within the Jataí Ecological Station, by means of a microcosm scale experiment. Results showed that a small fraction of the pesticide is quickly dragged to the sediment while most of it remains in the water column. Biodegradation proves to be an important fipronil degradation route, especially when microorganisms capable of using fipronil as sole carbon source increase their population, as a function of exposure time. Biodegradation rates were higher in the sediment than in the water column.
Peret
André Moldenhauer
AM
Departmento de Química, Universidade Federal de São Carlos, São Carlos, SP, Brazil. andreperet@yahoo.com
Oliveira
Luciana Fontes
LF
Bianchini
Irineu
I
Seleghim
Mirna Helena Regali
MH
Peret
Alberto Carvalho
AC
Mozeto
Antonio Aparecido
AA
D001673:Biodegradation, Environmental; D001938:Brazil; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry / Q000382:microbiology; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000032:analysis*; D007700:Kinetics; D008956:Models, Chemical; D009584:Nitrogen / Q000032:analysis; D010100:Oxygen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D011720:Pyrazoles / Q000032:analysis*; D012623:Seawater / Q000737:chemistry* / Q000382:microbiology; D014874:Water Pollutants, Chemical / Q000032:analysis*
D007306:Insecticides; D011720:Pyrazoles; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen; C082360:fipronil; D010100:Oxygen