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Soil-to-indoor air exposure models for volatile organic compounds: The effect of soil moisture†
Article first published online: 26 OCT 2009
Copyright © 1997 SETAC
Environmental Toxicology and Chemistry
Volume 16, Issue 12, pages 2597–2604, December 1997
How to Cite
Sanders, P. F. and Talimcioglu, N. M. (1997), Soil-to-indoor air exposure models for volatile organic compounds: The effect of soil moisture. Environmental Toxicology and Chemistry, 16: 2597–2604. doi: 10.1002/etc.5620161223
- Issue published online: 26 OCT 2009
- Article first published online: 26 OCT 2009
- Manuscript Accepted: 2 JUN 1997
- Manuscript Received: 10 NOV 1996
- Volatile organic compounds;
- Indoor air;
- Soil moisture;
Two finite-source models that calculate volatilization of contaminants from soil to indoor air were used to study the effect of soil moisture on indoor air concentrations and inhaled doses, using a representative model volatile organic chemical. A hypothetical scenario was used that assumed that subsurface contaminant diffuses through a layer of clean soil and is then swept into the building interior via advection. Both models simulated depletion of source contaminant via volatilization and degradation. One was an analytical model adapted from the behavior assessment model of Jury et al., which could be used to calculate time-dependent volatilization rates (and indoor air concentrations) as a function of constant soil moisture contents and steady-state moisture advection. The second model, the Integrated Moisture Plus Contaminant Transport (IMPACT) model, had the additional capability of simulating daily and seasonal variations in soil moisture behavior from actual daily temperature and rainfall data. Predicted indoor air concentrations and inhaled doses for the model contaminant varied by up to seven orders of magnitude, depending on the soil moisture conditions and whether or not contaminant degradation was considered. Over extended time periods, inhaled doses predicted under conditions of daily and seasonal variations in soil moisture were in general agreement with those predicted using average soil moistures or average moisture fluxes, suggesting that simplified treatment of soil moisture behavior may be adequate if accurate soil moisture data are available.