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Influence of air-water interfacial adsorption and gas-phase partitioning on the transport of organic chemicals in unsaturated porous media
Abstract
We investigated in laboratory column experiments, the aqueous-phase transport of four n -alcohols ( n -hexanol− n -nonanol), three chlorinated aromatic compounds (chlorobenzene, o -dichlorobenzene, and o -chlorophenol), and two alkylbenzenes (ethylbenzene and p -xylene) in a water-unsaturated porous medium (sand). The influence of gas-phase partitioning and interfacial adsorption on solute retardation during steady unsaturated water flow was evalu ated over a range of water contents. Air−water interfacial adsorption was a significant factor for the retardation of n -alcohols. For example, nearly 90% of the measured retardation of n -nonanol could be attributed to interfacial adsorption at a water saturation of 34%. Aromatic compounds used in this study were not significantly affected by adsorption at the air−water interface because of both low air−water interfacial area (0−50 cm 2 /cm 3 ) generated in the unsaturated porous medium and the small interfacial−adsorption coefficients. Instead, gas-phase partitioning was the primary mechanism responsible for the measured retardation of most of the aromatic compounds evaluated in this study. Using the batch-measured interfacial adsorption coefficients for n -octanol and n -nonanol and the column-measured retardation factors, the effective air−water interfacial areas were estimated. These values agreed closely with those we reported earlier, based on displacement experiments with an anionic surfactant as an interfacial tracer.
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Kim et al. (1998) demonstrated with column experiments that partitioning to the soil atmosphere contributed approximately 15-66% of total retardation for transport of several aromatic compounds.
“For example, Kim et al. (1998) demonstrated with a series of column experiments that such partitioning contributed approximately 15–66%, of total retardation for transport of several aromatic compounds.”
From Assessing the potential contributions of additional retention processes to PFAS retardation in the subsurface (2018) · cites this paper as Kim et al. (1998)
The Kni value of approximately 0.0005 cm is in the range of values reported for various polar organic compounds.
“This is in the range of values reported for various polar organic compounds (Kim et al., 1998; Costanza and Brusseau, 2000).”
From Assessing the potential contributions of additional retention processes to PFAS retardation in the subsurface (2018) · cites this paper as Kim et al., 1998
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Cited by
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Brusseau, M. L. (2018) · Science of The Total Environment · doi:10.1016/j.scitotenv.2017.09.065 · Cited by 306
Adsorption of PFOA at the air-water interface during transport in unsaturated porous media
Lyu, Y., Brusseau, M. L., Chen, W., Yan, N., Fu, X., & Lin, X. (2018) · Environmental Science & Technology · doi:10.1021/acs.est.8b02348 · Cited by 259
Brusseau, M. L. (2019) · Water Research · doi:10.1016/j.watres.2018.12.057 · Cited by 157
Metadata
- Authors
- Kim, H., Annable, M. D., & Rao, P. S. C.
- Affiliations
- Interdisciplinary Program in Hydrologic Sciences, University of Florida, Gainesville, Florida 32611
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 1998-03-24
- Volume
- 32
- Issue
- 9
- Pages
- 1253-1259
- ISSN
- 0013-936X
- 1520-5851
- Cited by
- 41
- References
- 0
- Language
- en
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