Ambient air at three different heights and surface chlorpyrifos residues were measured for 7 days following broadcast (Dursban) and total release aerosol (K-RID) chlorpyrifos applications for flea control in four dormitory rooms.
All rooms were ventilated with forced air for 30 min immediately following applications.
One room of each type was then maintained with no ventilation, while the other rooms were ventilated by forced air for an additional 4 h and by ambient air on subsequent study days.
Peak air concentrations of 118 mug/m3 (broadcast) and 82 mug/m3 (aerosol) were measured at 4-12 h postapplication.
Concentrations decreased rapidly over the first 4 days postapplication and remained low (1 mug/m3) and relatively constant on days 5-7.
Forced air ventilation reduced air concentrations only transiently in the broadcast room, and subsequent ambient air ventilation had little effect.
In the aerosol room, however, ventilation decreased air concentrations substantially.
Broadcast applications resulted in 7.5 times more total deposited chlorpyrifos on carpets than aerosol applications ; however, dislodgeable residues on carpets were only 2-fold greater.
Chlorpyrifos residues deposited on nontarget surfaces (e.g., furniture) by aerosol applications were 140-500 times greater than by broadcast applications. (...)
Mots-clés Pascal : Etablissement scolaire, Dortoir, Pollution intérieur, Produit agrochimique, Pesticide, Chlore Composé organique, Chlorpyrifos, Teneur air ambiant, Devenir polluant, Retombée, Prévention pollution, Ventilation, Exposition, Analyse risque, Enfant, Homme
Mots-clés Pascal anglais : Educational facility, Dormitory, Indoor pollution, Agricultural chemical product, Pesticides, Chlorine Organic compounds, Chlorpyrifos, Ambient air concentration, Pollutant behavior, Fallout, Pollution prevention, Ventilation, Exposure, Risk analysis, Child, Human
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0319147
Code Inist : 001D16C06. Création : 27/11/1998.