Crossing redox boundaries – aquifer redox history and effects on iron mineralogy and arsenic availability

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dc.contributor.authorBanning, Andre
dc.contributor.authorRüde, Thomas R.
dc.contributor.authorDölling, Bettina
dc.date.accessioned2021-12-08T12:41:07Z
dc.date.available2021-12-08T12:41:07Z
dc.date.issued2012-12-16
dc.date.updated2021-11-23T15:24:55Z
dc.description.abstractCretaceous shallow marine sediments from northwestern Germany exhibit a distinct colour and geochemical boundary in a depth of several decametres, witnessing a terrestrial oxidative paleo redox process which resulted in cement loss and oxidation of Fe(II) phases. Sediment samples were obtained from boreholes drilled in near-coastal and further basinward paleo environments, including both reduced and oxidized redox facies, to characterize As and Fe occurrence in unaltered layers and redistributional consequences of the redox event. Geochemical and mineralogical composition and As fractionation were assessed. Arsenic resides in pyrite in the reduced section with a bulk rock maximum concentration of 39 μg g−1, calculated Aspyrite is ∼0.2 wt.%. Siderite concretions in the fine sands do not function as As sinks, neither does glauconite whose general As/Fe leaching behaviour was characterized. In the zone of redox transition, reduced and oxidized phases coexist and elevated As concentrations (up to 73 μg g−1) with high proportions of reactive As were detected. Arsenic behaviour changes from relatively homogeneous Fe sulphide-control in the unaltered sediments to very heterogeneous Fe hydroxide-control above the paleo redox boundary. The studied characteristics determine recent As availability in the subsurface and must be considered during groundwater extraction from this highly important aquifer.en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationBanning, A., Rüde, T. R. and Dölling, B. (2013) ‘Crossing redox boundaries—Aquifer redox history and effects on iron mineralogy and arsenic availability’, Journal of Hazardous Materials, 262, pp. 905-914. doi: 10.1016/j.jhazmat.2012.12.015en
dc.identifier.doi10.1016/j.jhazmat.2012.12.015en
dc.identifier.endpage914en
dc.identifier.issn1873-3336
dc.identifier.journaltitleJournal of Hazardous Materialsen
dc.identifier.startpage905en
dc.identifier.urihttps://hdl.handle.net/10468/12332
dc.identifier.volume262en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S0304389412011806
dc.rights© 2012 Elsevier BV. This manuscript version is made available under the CC-BY-NC-ND 4.0 licenseen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectArsenicen
dc.subjectPaleo redox eventen
dc.subjectIron mineralsen
dc.subjectRedistributionen
dc.subjectGlauconiteen
dc.titleCrossing redox boundaries – aquifer redox history and effects on iron mineralogy and arsenic availabilityen
dc.typeArticle (peer-reviewed)en
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