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    Geochemical effects of electro-osmosis in clays

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    Type
    Article
    Authors
    Loch, J. P. Gustav
    Lima, Ana Teresa
    Kleingeld, Pieter J.
    KAUST Grant Number
    KUK-C1-017-12
    Date
    2010-02-13
    Online Publication Date
    2010-02-13
    Print Publication Date
    2010-06
    Permanent link to this record
    http://hdl.handle.net/10754/598408
    
    Metadata
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    Abstract
    Geochemical effects of electro-osmosis in bentonite clay are studied in the laboratory, where a 6 mm thick bentonite layer is subjected to direct current. Acidification and alkalization near anode and cathode are expected, possibly causing mineral deterioration, ion mobilization and precipitation of new solids. Afterwards the clay is analysed by XRF and anolyte and catholyte are analysed by ICP-MS. In addition, as a preliminary experiment treated bentonite is analysed by high resolution μ-XRF. Electro-osmotic flow is observed. Due to its carbonate content the bentonite is pH-buffering. Alkalization in the catholyte is substantial. Ca, Na and Sr are significantly removed from the clay and accumulate in the catholyte. Recovery in the catholyte accounts for a small fraction of the element-loss from the clay. The rest will have precipitated in undetected solid phases. μ-XRF indicates the loss of Ca-content throughout the bentonite layer. © The Author(s) 2010.
    Citation
    Loch JPG, Lima AT, Kleingeld PJ (2010) Geochemical effects of electro-osmosis in clays. Journal of Applied Electrochemistry 40: 1249–1254. Available: http://dx.doi.org/10.1007/s10800-010-0098-6.
    Sponsors
    This publication was based on work supported by Award No KUK-C1-017-12, made by King Abdullah University of Science and Technology (KAUST).
    Publisher
    Springer Nature
    Journal
    Journal of Applied Electrochemistry
    DOI
    10.1007/s10800-010-0098-6
    ae974a485f413a2113503eed53cd6c53
    10.1007/s10800-010-0098-6
    Scopus Count
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