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dc.contributor.author
Wigger, Cornelia
dc.contributor.author
Plötze, Michael
dc.contributor.author
Van Loon, Luc R.
dc.date.accessioned
2019-01-07T14:10:31Z
dc.date.available
2019-01-07T13:41:25Z
dc.date.available
2019-01-07T14:10:31Z
dc.date.issued
2018-08
dc.identifier.other
10.1346/ccmn.2018.064101
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/314062
dc.identifier.doi
10.3929/ethz-b-000314062
dc.description.abstract
Several barrier types are envisaged to minimize the release of radionuclides from waste matrices into groundwater. In a number of countries argillaceous rocks make up the natural barrier that will isolate radioactive substances from the aquifer. The present study addresses the influence of pore geometry as a limiting factor for anion diffusion in argillaceous rocks. Irrespective of the pore core size, anion diffusion can be limited by the pore-size opening, i.e. if the pore opening is so narrow that the electric double layers overlap and form a barrier to anions irrespective of the pore size. This so-called ‘bottleneck effect’ limits the anion diffusion. The present study extends previous investigations that focused on other factors which limit anion diffusion, e.g. mineralogy or interlayer equivalent pores. The existence of bottleneck pores was confirmed by effective tortuosity calculations and retention-potential measurements using mercury intrusion porosimetry. On the basis of two different core samples from argillaceous rocks from Switzerland, Opalinus Clay and Helvetic Marl, this work shows evidence of the existence of bottleneck pores. The larger permanent anion exclusion in the Helvetic Marl sample compared to the Opalinus Clay sample can be explained by the larger retention potential and larger effective tortuosity of the Helvetic Marl rock, which indicates more pores with bottleneck effects than is the case for the Opalinus Clay rock.
en_US
dc.language.iso
en
en_US
dc.publisher
Clay Minerals Society (CMS)
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.subject
Bottleneck Effect
en_US
dc.subject
Opalinus Clay
en_US
dc.subject
Porosity
en_US
dc.subject
Retention Potential
en_US
dc.subject
Tortuosity
en_US
dc.title
Pore geometry as a limiting factor for anion diffusion in argillaceous rocks
en_US
dc.type
Journal Article
dc.rights.license
In Copyright - Non-Commercial Use Permitted
dc.date.published
2018-05-22
ethz.journal.title
Clays and Clay Minerals
ethz.journal.volume
66
en_US
ethz.journal.issue
4
en_US
ethz.pages.start
329
en_US
ethz.pages.end
338
en_US
ethz.size
35 p.
en_US
ethz.version.deposit
acceptedVersion
en_US
ethz.publication.place
Chantilly, VA
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02607 - Institut für Geotechnik / Institute for Geotechnical Engineering::03691 - Puzrin, Alexander / Puzrin, Alexander::08669 - Gruppe ClayLab
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02607 - Institut für Geotechnik / Institute for Geotechnical Engineering::03691 - Puzrin, Alexander / Puzrin, Alexander::08669 - Gruppe ClayLab
en_US
ethz.date.deposited
2019-01-07T13:41:28Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-01-07T14:10:50Z
ethz.rosetta.lastUpdated
2019-01-07T14:10:50Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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