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

Show simple item record Elo, O. Hölttä, P. Kekäläinen, P. Voutilainen, M. Huittinen, Nina Maria 2019-04-24T10:39:01Z 2019-04-24T10:39:01Z 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 .
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.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.uri info:eu-repo/semantics/openAccess
dc.subject 116 Chemical sciences
dc.subject 1171 Geosciences
dc.title Neptunium(V) transport in granitic rock : A laboratory scale study on the influence of bentonite colloids en
dc.type Article
dc.contributor.organization Department of Chemistry
dc.description.reviewstatus Peer reviewed
dc.relation.issn 0883-2927
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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