Enrichment processes of arsenic in oxidic sedimentary rocks – from geochemical and genetic characterization to potential mobility.

dc.contributor.authorBanning, Andre
dc.contributor.authorRüde, Thomas R.
dc.date.accessioned2021-12-08T13:59:53Z
dc.date.available2021-12-08T13:59:53Z
dc.date.issued2010-06-01
dc.date.updated2021-11-23T15:28:51Z
dc.description.abstractSedimentary marine iron ores of Jurassic age and Tertiary marine sandy sediments containing iron hydroxides concretions have been sampled from boreholes and outcrops in two study areas in Germany to examine iron and arsenic accumulation processes. Samples were analyzed for bulk rock geochemistry (INAA/ICP-OES), quantitative mineralogy (XRD with Rietveld analysis), element distribution (electron microprobe) and arsenic fractionation (sequential extraction). Bulk Jurassic ores contain an average arsenic content of 123 μg g−1 hosted in mainly goethite ooids which slowly formed in times of condensed sedimentation. Enrichment occurred syndepositionally and is therefore characterized as primary. Iron concretions in Tertiary sediments mainly consist of goethite and yield arsenic up to 1860 μg g−1. The accumulation process is secondary as it took place in the course of oxidation of the originally reduced marine sediments under terrestrial conditions, leading to element redistribution and local enrichment in the near-surface part. The scale of enrichment was assessed calculating Enrichment Factors, indicating that arsenic accumulation was favoured over other potential contaminants. In spite of higher bulk arsenic contents in the oxidic rocks, the mainly pyrite-hosted As pool within the reduced deeper part of the Tertiary sediments is shown to have a higher potential for remobilization and creation of elevated arsenic concentrations in groundwater.en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationBanning, A. and Rüde, T. R. (2010) 'Enrichment processes of arsenic in oxidic sedimentary rocks - from geochemical and genetic characterization to potential mobility', Water Research, 44 (19), pp. 5512-5531. doi: 10.1016/j.watres.2010.05.034en
dc.identifier.doi10.1016/j.watres.2010.05.034en
dc.identifier.endpage5531en
dc.identifier.issn1879-2448
dc.identifier.issued19en
dc.identifier.journaltitleWater Researchen
dc.identifier.startpage5521en
dc.identifier.urihttps://hdl.handle.net/10468/12335
dc.identifier.volume44en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S0043135410003428
dc.rights© 2010 Elsevier Ltd. 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.subjectAccumulation processen
dc.subjectIron mineralen
dc.subjectEnrichment factoren
dc.subjectRedox conditionsen
dc.subjectMobilizationen
dc.titleEnrichment processes of arsenic in oxidic sedimentary rocks – from geochemical and genetic characterization to potential mobility.en
dc.typeArticle (peer-reviewed)en
Files
Original bundle
Now showing 1 - 2 of 2
Loading...
Thumbnail Image
Name:
1-s2.0-S0043135410003428-main.pdf
Size:
2.6 MB
Format:
Adobe Portable Document Format
Description:
Published version. Author's original
Loading...
Thumbnail Image
Name:
Banning_Ruede_manuscript_R1_100410.pdf
Size:
360.53 KB
Format:
Adobe Portable Document Format
Description:
Accepted version
License bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
license.txt
Size:
2.71 KB
Format:
Item-specific license agreed upon to submission
Description: