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    The Gas-Absorption/Chemical-Reaction Method for Measuring Air-Water Interfacial Area in Natural Porous Media

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    Name:
    Lyu_et_al-2017-Water_Resources ...
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    Author
    Lyu, Ying
    Brusseau, Mark L. cc
    El Ouni, Asma
    Araujo, Juliana B.
    Su, Xiaosi
    Affiliation
    Univ Arizona, Dept Hydrol & Atmospher Sci
    Univ Arizona, Sch Earth & Environm Sci, Dept Soil Water & Environm Sci
    Issue Date
    2017-11
    Keywords
    gas absorption
    interfacial area
    fluid-fluid interface
    
    Metadata
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    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    The Gas-Absorption/Chemical-Reaction Method for Measuring Air-Water Interfacial Area in Natural Porous Media 2017, 53 (11):9519 Water Resources Research
    Journal
    Water Resources Research
    Rights
    © 2017. American Geophysical Union. All Rights Reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The gas-absorption/chemical-reaction (GACR) method used in chemical engineering to quantify gas-liquid interfacial area in reactor systems is adapted for the first time to measure the effective air-water interfacial area of natural porous media. Experiments were conducted with the GACR method, and two standard methods (X-ray microtomographic imaging and interfacial partitioning tracer tests) for comparison, using model glass beads and a natural sand. The results of a series of experiments conducted under identical conditions demonstrated that the GACR method exhibited excellent repeatability for measurement of interfacial area (A(ia)). Coefficients of variation for A(ia) were 3.5% for the glass beads and 11% for the sand. Extrapolated maximum interfacial areas (A(m)) obtained with the GACR method were statistically identical to independent measures of the specific solid surface areas of the media. For example, the A(m) for the glass beads is 29 (1) cm(-1), compared to 32 (3), 30 (2), and 31 (2) cm(-1) determined from geometric calculation, N2/BET measurement, and microtomographic measurement, respectively. This indicates that the method produced accurate measures of interfacial area. Interfacial areas determined with the GACR method were similar to those obtained with the standard methods. For example, A(ia)s of 47 and 44 cm(-1) were measured with the GACR and XMT methods, respectively, for the sand at a water saturation of 0.57. The results of the study indicate that the GACR method is a viable alternative for measuring air-water interfacial areas. The method is relatively quick, inexpensive, and requires no specialized instrumentation compared to the standard methods.
    Note
    6 month embargo; published online: 22 November 2017
    ISSN
    00431397
    DOI
    10.1002/2017WR021717
    Version
    Final published version
    Sponsors
    NIEHS Superfund Research Program [P42 ES04940]; China Scholarship Council
    Additional Links
    http://doi.wiley.com/10.1002/2017WR021717
    ae974a485f413a2113503eed53cd6c53
    10.1002/2017WR021717
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