Modeling of Indoor Air Quality and Exposure (Astm Special by Niren Laxmichand Nagda

By Niren Laxmichand Nagda

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Afterwards, a clean atmosphere was provided at the chamber inlet. Equilibrium sorbed-phase concentrations were estimated from the integrated VOC mass efflux from the chamber minus the mass in the chamber air at equilibrium. 95 indicated that a linear fit to the data accounted for most of the observed variability. For the nylon carpet, assuming a typical carpet weight of 2000 g/m2 of projected area, the partition coefficients reported by Tichenor et al. [15] can be converted to units consistent with those used here, yielding values of K on the order of 103 cm3/g for both tetrachloroethylene and ethylbenzene.

Davidson, C. , and Andelman, J. , "Small Closed-Chamber Measurements for the Uptake of Trichloroethylene and Ethanol Vapor by Fibrous Surfaces," Modeling of Indoor Air Quality and Exposure, ASTM STP 1205, Niren L. , American Society for Testing and Materials, Philadelphia, 1993, pp. 25-41. ABSTRACT: Recent efforts to quantify the effect of sorption on indoor concentrations of volatile organic compounds (VOCs) have indicated that indoor surfaces may behave as reservoirs for VOCs emitted from other sources.

First, partition coefficients for the polar compound EtOH are higher on the hydrophilic surfaces (cotton, jute, wool, and nylon) than on those that are more hydrophobic. In contrast, partition coefficients for TCE are higher on the hydrophobic surfaces than on those that are more hydrophilic. Polyester is an exception, with approximately the same partition coefficients for both TCE and EtOH. Second, when VOCtsurface interaction is favored, partition coefficients are an order of magnitude larger for EtOH (103 cm3/g) than for TCE (102 cm3/g); this reflects the stronger nature of the polar-polar interactions relative to those due to nonspecific dispersion (Van der Waals) forces.

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