Geochemical effects of electro-osmosis in clays |
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Authors: | J P Gustav Loch Ana Teresa Lima and Pieter J Kleingeld |
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Affiliation: | (1) Department of Earth Sciences, Utrecht University, P.O. Box 80021, 3508TA Utrecht, The Netherlands |
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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. |
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