PMID: 11900330Mar 20, 2002Paper

Modeling the effects of concentration history on the slow desorption of trichloroethene from a soil at 100% relative humidity

Journal of Contaminant Hydrology
C J Werth, Karen M Hansen

Abstract

To determine the effects of concentration history on slow sorption processes, desorption kinetic profiles for trichloroethene (TCE) were measured for a soil at 100% relative humidity subject to different exposure concentrations and exposure times. Exposure concentrations ranged from 1% to 80% of the saturation vapor pressure (Ps) for TCE, and exposure times (i.e., time allowed for sorption before desorption begins) ranged from 1 to 96 days. A spherical diffusion model based on a gamma distribution of sorption rates and a gamma distribution of desorption rates was developed and applied to the data. At 80% P/Ps, the entire gamma distributions of sorption and desorption rates were available for TCE. In accordance with a micropore filling mechanism, the fraction of these distributions available for TCE sorption decreased with decreasing P/Ps. Experimental results are consistent with a micropore-filling mechanism, where the amount of slow desorbing mass decreased with decreasing exposure time, and the fraction of slow desorbing sites filled decreased with decreasing exposure concentration. Simulation results suggest that diffusion limits the rates that micropores fill, and that rates of sorption and desorption for soil contaminated ...Continue Reading

References

Jan 1, 1994·Environmental Science & Technology·B GuJ F McCarthy
Jul 1, 1995·Environmental Science & Technology·J A Pedit, C T Miller
Nov 1, 1994·Environmental Science & Technology·J A Pedit, C T Miller
Nov 1, 1995·Environmental Science & Technology·W Chen, R J Wagenet

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Citations

Dec 25, 2013·Journal of Contaminant Hydrology·Munjed A Maraqa, Saud A Khashan
Feb 18, 2004·Journal of Environmental Quality·Rossane C DeLapp, Eugene J LeBoeuf
Jul 2, 2010·Environmental Science & Technology·Samuel OuobaJean-Claude Bénet
Jan 31, 2004·Environmental Science & Technology·Jun Li, Charles J Werth

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