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Use of a Box Model to Estimate the Airborne Concentration of Volatilized DDT in an Experimental Hut in a Tropical Climate
UNIFORMED SERVICES UNIV OF THE HEALTH SCIENCES BETHESDA MD BETHESDA United States
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Airborne emission rates for DDT from cloth material generated in a laboratory setting using a thermal micro-chamber over a range of temperatures were integrated into a well mixed box WMB model to predict volatilized DDT concentrations emitting from netting material hung inside an experimental hut in Thailand. Field sampling was conducted in order to evaluate agreement between observed samples and model predictions for volatilized DDT inside the hut. Results show the model fit was consistent with empirically derived airborne emission data and theoretical within one order of magnitude. However, field results were not consistent with empirical or theoretical results according to ASTM D5157-97, NMSE 4.17, and a fractional bias FS of 1.45 data when accounting only for volatilized DDT concentration levels. A correlation was observed between data from Weschler et al. and the WMB model results when accounting for DDT in both the vapor phase and particulate phase. The WMB model has utility as a tool to estimate occupational exposures with a protective range of one order of magnitude.
APPROVED FOR PUBLIC RELEASE