Distribution of Chlorphyrifos in Air, Carpeting, and Dust and Its Reemission fromCarpeting Following the Use of Total Release Aerosols in an Indoor Air Quality Test House

摘要

The paper gives results of experiments to explore the relationships between theinsecticide chlorpyrifos and its distribution into carpet, carpet dust, and reemission into air. Two total release aerosols containing 0.5% chlorpyrifos were applied in the living room and den of EPA's test house in North Carolina. Afterwards, surface and carpet depositions, and carpet dust concentrations were determined. Portions of the contaminated carpet were removed and placed in environmental chambers (0.53 cu m). Emissions of chlorpyrifos from carpet to air were determined. Air exchange rates and airborne chlorpyrifos concentrations were measured in the test house over a 2 week-period. Airborne chlorpyrifos concentrations in the treated rooms of the test house exceeded 10 micrograms/cu m of air following 1 hour of enhanced ventilation and declined by < 1 microgram/cu m by post-application day 14.