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THE DISTRIBUTION OF CHLORPYRIFOSIN AIR, CARPETING, AND DUST AND ITS REEMISSION FROM CARPETING FOLLOWING THE USE OF TOTAL RELEASE AEROSOLS IN AN INDOOR AIR QUALITY TEST HOUSE
Citation:
Mason*, M A., L S. Sheldon, Z Guo*, AND D M. Stout II. THE DISTRIBUTION OF CHLORPYRIFOSIN AIR, CARPETING, AND DUST AND ITS REEMISSION FROM CARPETING FOLLOWING THE USE OF TOTAL RELEASE AEROSOLS IN AN INDOOR AIR QUALITY TEST HOUSE. Presented at Engineering Solution to IAQ Problems, Raleigh, NC, 7/17-19/2000.
Description:
The paper gives results of experiments to explore the relationships between the insecticide 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 (0.053 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 to <1 microgram/cu m by post-application day 14. Concentrations in the untreated bedroom were 11 times lower than in the den and living room following the ventilation, reached maximum levels by day 2, and declined <0.5 microgram/cu m by day 14. Surface loadings for dust were low compared to total surface deposition levels. No vertical stratification was observed within rooms. Total levels quantified from the carpet extraction and deposition coupons were similar.