Ex and in situ reactivity and sorption of selenium in Opalinus clay in the presence of a selenium reducing microbial community

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Ex and in situ reactivity and sorption of selenium in Opalinus clay in the presence of a selenium reducing microbial community. / Bleyen, Nele; Small, Joe; Mijnendonckx, Kristel; Hendrix, Katrien; Albrecht, Achim; De Cannière, Pierre; Surkova, Maryna; Wittebroodt, Charles; Valcke, Elie.

In: Minerals, Vol. 11, No. 757, 11070757, 13.07.2021, p. 1-33.

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Bleyen, Nele ; Small, Joe ; Mijnendonckx, Kristel ; Hendrix, Katrien ; Albrecht, Achim ; De Cannière, Pierre ; Surkova, Maryna ; Wittebroodt, Charles ; Valcke, Elie. / Ex and in situ reactivity and sorption of selenium in Opalinus clay in the presence of a selenium reducing microbial community. In: Minerals. 2021 ; Vol. 11, No. 757. pp. 1-33.

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@article{bcba0840b20844deaf63cc76890ccb95,
title = "Ex and in situ reactivity and sorption of selenium in Opalinus clay in the presence of a selenium reducing microbial community",
abstract = "79Se is a critical radionuclide concerning the safety of deep geological disposal of certain radioactive wastes in clay-rich formations. To study the fate of selenium oxyanions in clayey rocks in the presence of a selenium reducing microbial community, in situ tests were performed in the Opalinus Clay at the Mont Terri Rock Laboratory (Switzerland). Furthermore, biotic and abiotic batch tests were performed to assess Se(VI) and Se(IV) reactivity in the presence of Opalinus Clay and/or stainless steel, in order to support the interpretation of the in situ tests. Geochemical modeling was applied to simulate Se(VI) reduction, Se(IV) sorption and solubility, and diffusion processes. This study shows that microbial activity is required to transform Se(VI) into more reduced and sorbing Se species in the Opalinus Clay, while in abiotic conditions, Se(VI) remains unreactive. On the other hand, Se(IV) can be reduced by microorganisms but can also sorb in the presence of clay without microorganisms. In situ microbial reduction of Se oxyanions can occur with electron donors provided by the clay itself. If microorganisms would be active in the clay surrounding a disposal facility, microbial reduction of leached Se could thus contribute to the overall retention of Se in clayey host rocks.",
keywords = "Diffusion, Reactivity, Clay, Mont Terri, Selenium reduction, Sorption, Opalinus clay, In situ, Batch tests",
author = "Nele Bleyen and Joe Small and Kristel Mijnendonckx and Katrien Hendrix and Achim Albrecht and {De Canni{\`e}re}, Pierre and Maryna Surkova and Charles Wittebroodt and Elie Valcke",
note = "Score=10",
year = "2021",
month = jul,
day = "13",
doi = "10.3390/min11070757",
language = "English",
volume = "11",
pages = "1--33",
journal = "Minerals",
issn = "2075-163X",
publisher = "MDPI",
number = "757",

}

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TY - JOUR

T1 - Ex and in situ reactivity and sorption of selenium in Opalinus clay in the presence of a selenium reducing microbial community

AU - Bleyen, Nele

AU - Small, Joe

AU - Mijnendonckx, Kristel

AU - Hendrix, Katrien

AU - Albrecht, Achim

AU - De Cannière, Pierre

AU - Surkova, Maryna

AU - Wittebroodt, Charles

AU - Valcke, Elie

N1 - Score=10

PY - 2021/7/13

Y1 - 2021/7/13

N2 - 79Se is a critical radionuclide concerning the safety of deep geological disposal of certain radioactive wastes in clay-rich formations. To study the fate of selenium oxyanions in clayey rocks in the presence of a selenium reducing microbial community, in situ tests were performed in the Opalinus Clay at the Mont Terri Rock Laboratory (Switzerland). Furthermore, biotic and abiotic batch tests were performed to assess Se(VI) and Se(IV) reactivity in the presence of Opalinus Clay and/or stainless steel, in order to support the interpretation of the in situ tests. Geochemical modeling was applied to simulate Se(VI) reduction, Se(IV) sorption and solubility, and diffusion processes. This study shows that microbial activity is required to transform Se(VI) into more reduced and sorbing Se species in the Opalinus Clay, while in abiotic conditions, Se(VI) remains unreactive. On the other hand, Se(IV) can be reduced by microorganisms but can also sorb in the presence of clay without microorganisms. In situ microbial reduction of Se oxyanions can occur with electron donors provided by the clay itself. If microorganisms would be active in the clay surrounding a disposal facility, microbial reduction of leached Se could thus contribute to the overall retention of Se in clayey host rocks.

AB - 79Se is a critical radionuclide concerning the safety of deep geological disposal of certain radioactive wastes in clay-rich formations. To study the fate of selenium oxyanions in clayey rocks in the presence of a selenium reducing microbial community, in situ tests were performed in the Opalinus Clay at the Mont Terri Rock Laboratory (Switzerland). Furthermore, biotic and abiotic batch tests were performed to assess Se(VI) and Se(IV) reactivity in the presence of Opalinus Clay and/or stainless steel, in order to support the interpretation of the in situ tests. Geochemical modeling was applied to simulate Se(VI) reduction, Se(IV) sorption and solubility, and diffusion processes. This study shows that microbial activity is required to transform Se(VI) into more reduced and sorbing Se species in the Opalinus Clay, while in abiotic conditions, Se(VI) remains unreactive. On the other hand, Se(IV) can be reduced by microorganisms but can also sorb in the presence of clay without microorganisms. In situ microbial reduction of Se oxyanions can occur with electron donors provided by the clay itself. If microorganisms would be active in the clay surrounding a disposal facility, microbial reduction of leached Se could thus contribute to the overall retention of Se in clayey host rocks.

KW - Diffusion

KW - Reactivity

KW - Clay

KW - Mont Terri

KW - Selenium reduction

KW - Sorption

KW - Opalinus clay

KW - In situ

KW - Batch tests

UR - https://ecm.sckcen.be/OTCS/llisapi.dll/open/45840242

U2 - 10.3390/min11070757

DO - 10.3390/min11070757

M3 - Article

VL - 11

SP - 1

EP - 33

JO - Minerals

JF - Minerals

SN - 2075-163X

IS - 757

M1 - 11070757

ER -

ID: 7203913