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Characterizing Gas−Water Interfacial and Bulk-Water Partitioning for Gas-Phase Transport of Organic Contaminants in Unsaturated Porous Media

Brusseau, Mark L., Popovičová, Jarmila, Silva, Jeff A. K.·1997·Environmental Science & Technology
DOI 10.1021/es960475j
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Abstract

This study was performed to investigate the impact of interfacial and bulk-water partitioning on the retention and retardation of gas-phase contaminants during transport in unsaturated porous media. Gas-flow experiments were conducted using columns packed with three types of sandy porous media. Moisture contents were 11.9%, 16.0%, and 9.4% for the columns packed with glass beads, silica sand, and aquifer material, respectively. Contaminant retardation was the sum of retention by the gas, aqueous, and solid phases and accumulation at the gas−water interface. The results indicated that 29−73% of total trichloroethene retardation was due to accumulation at the gas−water interface, depending on porous media type. Partitioning into the bulk water accounted for 12−30% of total trichloroethene retardation for the various systems. Given the potential significance of interfacial and bulk-water retention for contaminant transport and remediation, it is important to consider methods for characterizing these processes at the field scale. Gas-phase tracer experi ments using a suite of phase-selective partitioning tracers in combination with nonreactive tracers, as presented herein, may be one viable approach. For example, CO 2 was used successfully to measure the bulk-water content of the system, and heptane was used to determine the effective gas−water interfacial area.

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  • Adsorption at the air-water interface contributed 29-73% of total TCE retardation for gas-phase transport in a bench-scale system, depending on porous-medium type.

    “For example, Brusseau and colleagues demonstrated for a bench-scale system that adsorption at the air-water interface contributed 29–73%, of total trichloroethene (TCE) retardation for gas-phase transport, depending on porous-medium type (Brusseau et al., 1997).”

    From Assessing the potential contributions of additional retention processes to PFAS retardation in the subsurface (2018) · cites this paper as Brusseau et al., 1997

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Research works printed but not linked: 16

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  12. Popovicova J., Hydrol
  13. Valsaraj K. T., 1994, Water Res., 28, 830, 10.1016/0043-1354(94)90088-4 · DOI
  14. Schwarzenbach R. P., 1993, Environmental Organic Chemistry, 238
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  16. Corley T. L., 1996, Environ. Sci. Technol., 30, 2891, 10.1021/es950644k · DOI

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Metadata

Authors
Brusseau, M. L., Popovičová, J., & Silva, J. A. K.
Affiliations
Department of Soil, Water and Environmental Science and Department of Hydrology and Water Resources, University of Arizona, Tucson, Arizona 85721
Venue
Environmental Science & Technology
Publisher
American Chemical Society (ACS)
Published
1997-05-29
Volume
31
Issue
6
Pages
1645-1649
ISSN
  • 0013-936X
  • 1520-5851
DOI
10.1021/es960475j
Cited by
78
References
0
Language
en

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