Neptunium(V) transport in granitic rock : A laboratory scale study on the influence of bentonite colloids

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dc.contributor University of Helsinki, Department of Chemistry en
dc.contributor University of Helsinki, Department of Chemistry en
dc.contributor University of Helsinki, Department of Chemistry en
dc.contributor University of Helsinki, Department of Chemistry en
dc.contributor University of Helsinki, Institute of Resource Ecology, Dresden en
dc.contributor.author Elo, O.
dc.contributor.author Hölttä, P.
dc.contributor.author Kekäläinen, P.
dc.contributor.author Voutilainen, M.
dc.contributor.author Huittinen, Nina Maria
dc.date.accessioned 2019-04-24T10:39:01Z
dc.date.available 2019-04-24T10:39:01Z
dc.date.issued 2019-04
dc.identifier.citation Elo , O , Hölttä , P , Kekäläinen , P , Voutilainen , M & Huittinen , N M 2019 , ' Neptunium(V) transport in granitic rock : A laboratory scale study on the influence of bentonite colloids ' , Applied Geochemistry , vol. 103 , pp. 31-39 . https://doi.org/10.1016/j.apgeochem.2019.01.015 en
dc.identifier.issn 0883-2927
dc.identifier.other PURE: 122914807
dc.identifier.other PURE UUID: 7f099d3a-1c69-477a-9188-97d5a3a884a5
dc.identifier.other Scopus: 85062226378
dc.identifier.other WOS: 000462031600004
dc.identifier.other ORCID: /0000-0001-5622-9208/work/56836488
dc.identifier.other ORCID: /0000-0002-2312-6410/work/56838182
dc.identifier.other ORCID: /0000-0002-5534-149X/work/56838229
dc.identifier.uri http://hdl.handle.net/10138/301163
dc.description.abstract In the present study neptunium(V) uptake by crystalline granitic rock (Kuru Grey granite) and the role of stable and mobile bentonite colloids (MX-80) on the migration of neptunium(V) was investigated. Two different experimental setups were utilized, batch-type experiments under stagnant conditions and column experiments under flowing water conditions. The uptake of 10(-6) M neptunium(V) by 40 g/L crushed granite in 10 mM NaClO4 was found to be pH-dependent, whereas neptunium(V) uptake by MX-80 bentonite colloids (0.08-0.8 g/L) was pH-independent up to a pH-value of approximately 11. Column experiments were conducted in the presence and absence of colloids at two pH values (pH = 8 and 10) and two flow rates (0.3 and 0.8 mL/h) in 10 mM NaClO4. The injected neptunium(V) concentration was 2x10(-4) M and the colloid concentration ranged from 0.08 to 0.32 g/L. The properties of the flow field in the columns were investigated with a conservative chloride tracer, at the same two flow rates of 0.8 and 0.3 mL/h. The resulting breakthrough curves were modeled using the analytical solution of advection-matrix diffusion equation. A tailing of neptunium(V) breakthrough curves in comparison to the conservative tracer was observed, which could be explained by a slightly higher retardation of neptunium(V) in the column caused by sorption on the granite. The sorption was in general lower at pH 8 than at pH 10. In addition, the tailing was almost identical in the absence and presence of MX-80 bentonite colloids, implying that the influence of colloids on the neptunium(V) mobility is almost negligible. en
dc.format.extent 9
dc.language.iso eng
dc.relation.ispartof Applied Geochemistry
dc.rights en
dc.subject 116 Chemical sciences en
dc.subject 1171 Geosciences en
dc.title Neptunium(V) transport in granitic rock : A laboratory scale study on the influence of bentonite colloids en
dc.type Article
dc.description.version Peer reviewed
dc.identifier.doi https://doi.org/10.1016/j.apgeochem.2019.01.015
dc.type.uri info:eu-repo/semantics/other
dc.type.uri info:eu-repo/semantics/publishedVersion
dc.contributor.pbl

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