Olivier X. Leupin
Swiss Federal Institute of Aquatic Science and Technology
Environmental chemistryAnalytical chemistryGeologyDiffusion (business)BoreholeRadionuclideSoil scienceInorganic chemistryChemistryGeotechnical engineeringIonic strengthMaterials scienceMineralogyBentoniteTRACEREnvironmental scienceArsenicSorptionPorosityBiogeochemical cycleRadioactive waste
39Publications
15H-index
1,860Citations
Publications 38
Newest
#1Paul WersinH-Index: 29
#2Jebril HadiH-Index: 5
Last. Olivier X. LeupinH-Index: 15
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Bentonite, a common smectite-rich buffer material, is in direct contact with corroding steel in many high-level radioactive waste repository designs. The interaction of iron with the smectite-rich clay may affect its swelling and sealing properties by processes such as alteration, redox reactions and cementation. The chemical interactions were investigated by analysing the Fe/clay interfaces of eight bentonite blocks which had been exposed to temperatures up to 130 °C for five years in the ABM2 ...
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#1Olivier X. LeupinH-Index: 15
#2N.R. SmartH-Index: 14
Last. N. DiomidisH-Index: 5
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Abstract Experimental evidence related to the interactions between steel corrosion and bentonite in deep geological repositories is reconsidered. The released Fe2+ interacts with the smectite and precipitates as Fe3+ when oxidised by residual immobile oxygen. This leads to the development of coloured fronts in the bentonite. The evolution of these fronts can be reproduced by a reactive transport model that takes account of the competition between diffusion and precipitation. Furthermore, two-pha...
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#1Max JaquenoudH-Index: 1
#2W. T. Elam (UW: University of Washington)H-Index: 24
Last. Olivier X. LeupinH-Index: 15
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Abstract During the last two decades, the Mont Terri rock laboratory has hosted an extensive experimental research campaign focusing on improving our understanding of radionuclide transport within Opalinus Clay. The latest diffusion experiment, the Diffusion and Retention experiment B (DR-B) has been designed based on an entirely different concept compared to all predecessor experiments. With its novel experimental methodology, which uses in-situ X-ray fluorescence (XRF) to monitor the progress ...
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#2Chao LiH-Index: 5
Last. Olivier X. LeupinH-Index: 15
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#1Patrik SellinH-Index: 10
#2Mary WestermarkH-Index: 1
Last. Johan SwahnH-Index: 1
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The aim of Beacon is to develop the understanding of fundamental processes that lead to material homogenisation, as well as to improve capabilities for numerical modelling. In earlier assessments of bentonite EBS, the mechanical interaction between the installed bentonite components has been neglected and an “ideal” final state has generally been assumed. Key features of the project are (1) re-evaluation of the available knowledge to extract the crucial data to compile the qualitative and quanti...
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#1Andreas JenniH-Index: 11
#2Paul WersinH-Index: 29
Last. Olivier X. LeupinH-Index: 15
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#1Josep M. SolerH-Index: 26
#2Carl I. SteefelH-Index: 58
Last. Veerle CloetH-Index: 3
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#2Carl I. SteefelH-Index: 58
Last. Veerle CloetH-Index: 3
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#1Josep M. Soler (CSIC: Spanish National Research Council)H-Index: 26
#2Carl I. Steefel (LBNL: Lawrence Berkeley National Laboratory)H-Index: 58
Last. Veerle CloetH-Index: 3
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Solute diffusion in compacted clays depends on ionic strength through its control on the thickness of the electrical double layer (EDL) on the charged clay surfaces. In the DR-A field experiment (Mont Terri, Switzerland), synthetic porewater was circulated through a borehole for 189 days, leading to the out-diffusion of a variety of tracers into the Opalinus Clay. The borehole solution was then replaced with a higher-salinity solution for an additional 540 days, leading to the diffusion of Cs+, ...
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#1Luc R. Van LoonH-Index: 24
#2Olivier X. LeupinH-Index: 15
Last. Veerle CloetH-Index: 3
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Abstract Through-diffusion experiments with 36 Cl − , 35 SO 4 2− and HTO in Opalinus Clay (OPA) samples from a deep borehole in North-East Switzerland (Benken; BE) have been performed. The effect of burial depth on the experimental results has been investigated. It could be shown that the effective diffusion coefficients decrease with sample depth for all three tracers. Moreover, there was a good correlation with the texture of the samples. The diffusion coefficients for HTO are the largest (D e...
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