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Measuring air-water interfacial areas with x-ray microtomography and interfacial partitioning tracer tests

Brusseau, Mark L., Peng, Sheng, Schnaar, Gregory, Murao, Asami·2007·Environmental Science & Technology
DOI 10.1021/es061474m
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Abstract

Air-water interfacial areas as a function of water saturation were measured for a sandy, natural porous medium using two methods, aqueous-phase interfacial partitioning tracer tests and synchrotron X-ray microtomography. In addition, interfacial areas measured in a prior study with the gas-phase interfacial partitioning tracer-test method for the same porous medium were included for comparison. For all three methods, total air-water interfacial areas increased with decreasing water saturation. The interfacial areas measured with the tracer-test methods were generally larger than those obtained from microtomography, and the disparity increased as water saturation decreased. The interfacial areas measured by microtomography extrapolated to a value (147 cm(-1)) very similar to the specific solid surface area (151 cm(-1)) calculated using the smooth-sphere assumption, indicating that the method does not characterize the area associated with microscopic surface heterogeneity (surface roughness, microporosity). This is consistent with the method resolution of approximately 12 microm. In contrast, the interfacial areas measured with the gas-phase tracer tests approached the N2/BET measured specific solid surface area (56000 cm(-1)), indicating that this method does characterize the interfacial area associated with microscopic surface heterogeneity. The largest interfacial area measured with the aqueous-phase tracer tests was 224 cm(-1), while the extrapolated maximum interfacial are…

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  • Setting Kni equal to Kai for PFOA and PFOS is a reasonable first approximation, supported by the similarity of Kni and Kai values measured for SDBS.

    “This is a reasonable first approximation, supported by the similarity of Kni and Kai values measured for a common surfactant used as an interfacial partitioning tracer, SDBS (Brusseau et al., 2007,2008, 2010).”

    From Assessing the potential contributions of additional retention processes to PFAS retardation in the subsurface (2018) · cites this paper as Brusseau et al., 2007

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Metadata

Authors
Brusseau, M. L., Peng, S., Schnaar, G., & Murao, A.
Affiliations
Soil, Water, and Environmental Science Department and Hydrology and Water Resources Department, 429 Shantz Building, #38, The University of Arizona, Tucson, Arizona 85721
Venue
Environmental Science & Technology
Publisher
American Chemical Society (ACS)
Published
2007-02-13
Volume
41
Issue
6
Pages
1956-1961
ISSN
  • 0013-936X
  • 1520-5851
DOI
10.1021/es061474m
Cited by
117
References
0
Language
en

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