Equilibrium vapor phase adsorption of volatile organic chemicals on dry soils

Poe, Scott H.; Valsaraj, K. T.; Thibodeaux, Louis J.; Springer, Charles S.

doi:10.1016/0304-3894(88)85071-4

Cited by 38 publications

(13 citation statements)

References 13 publications

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“…Recently, several investigators have measured the partitioning of VOCs between air-dry soil (soils having moisture present as sorbed water only) and the vapor phase, and these measurements have resulted in nonlinear BET sorption isotherms (2)(3)(4)(5)(6). In studies where VOC sorption was measured in the presence of constant water vapor pressure, high sorptive uptake resulting in nonlinear BET isotherms was observed at relative humidities approaching 0% (and, therefore, soils having essentially no moisture).…”

Section: Introductionmentioning

confidence: 99%

Effects of nonlinear sorption on the diffusion of benzene and dichloromethane from two air-dry soils

Shonnard¹,

Bell²,

Jackman³

1993

Environ. Sci. Technol.

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In order to test for the effects of nonlinear sorption on the diffusive transport of volatile organic compounds (VOCs) through air-dry soils, diffusion and sorption experiments were conducted with two air-dry soils using benzene and dichloromethane (DCM). Sorption isotherms in the presence of relative humidity were measured in both soils using a static sorption chamber and were in excellent agreement with the BET model. Diffusive emission rates from isothermal and uniformly contaminated air-dry soils were measured in a one-dimensional soil column under transient conditions. Matching the linear equilibrium sorption diffusion model to the emission rate data resulted in apparent diffusivities that were found to increase with increasing initial VOC concentration in the soil. This observation was also confirmed theoretically and attributed to nonlinear BET sorption. At low contaminant loadings, in the linear sorption range, the BET sorption parameters were successfully used to predict the apparent diffusivities for diffusion experiments.

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Section: Introductionmentioning

confidence: 99%

Effects of nonlinear sorption on the diffusion of benzene and dichloromethane from two air-dry soils

Shonnard¹,

Bell²,

Jackman³

1993

Environ. Sci. Technol.

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“…Much effort has also focused on VOC transport modeling [Springer et al, 1983;Jury et al, 1983;Thibodeaux et al, 1988;Cohen et al, 1988;Cohen and Ryan, 1989;Shoemaker et al, 1990;Ismail et al, 1991;Kirk and Nye, 1991;Roy and Griffin, 1991;Culver et al, 1991;Gierke et al, 1992;Nye et al, 1994;Jury et al, 1984]. Most of the existing models are based on the assumptions of constant temperature and soil moisture content, and many models completely ignore the sorption of chemical vapors to the soil surface.…”

Section: Voc Transport Modelsmentioning

confidence: 99%

Effect of dynamic competitive sorption on the transport of volatile organic chemicals through dry porous media

Thoma¹,

Swofford²,

Popov³

et al. 1999

Water Resources Research

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“…In the unsaturated zone, particularly in dry soils, adsorption onto the soil mineral and organic component surfaces plays an important role in mobility and retardation of VOCs during gaseous transport [2,3]. Therefore, an accurate description and understanding of the sorption mechanisms and behavior of organic contaminants are of great importance.…”

Section: Introductionmentioning

confidence: 99%

Comparison of perchloroethylene extraction techniques in soil gas survey quantification

2009

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Abstract:Subsurface pollution by volatile organic compounds has emerged as a widespread problem in industrialized countries. This study compares static headspace technique and methanol extraction/purge-and-trap analysis followed by thermal desorption/gas chromatography in attempts for quantification of gas survey results in the determination of these chemicals in soil. Several soils were contaminated with aqueous solution of perchloroethylene (PCE) (140 mg L -1 ) using a vapor treatment method. Soil spiking took place up to 24 h in desiccator by exposing individual soil samples contained in open 40 mL glass vials to PCE evaporated from the solution. After exposure the samples were stored and analyzed within 2 days. The achieved results strongly suggest that gas extraction can provide quantitative results, regarding PCE concentration in soils, which are not significantly different from liquid based extraction analysis. © Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Equilibrium vapor phase adsorption of volatile organic chemicals on dry soils

Cited by 38 publications

References 13 publications

Effects of nonlinear sorption on the diffusion of benzene and dichloromethane from two air-dry soils

Effects of nonlinear sorption on the diffusion of benzene and dichloromethane from two air-dry soils

Effect of dynamic competitive sorption on the transport of volatile organic chemicals through dry porous media

Comparison of perchloroethylene extraction techniques in soil gas survey quantification

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