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dc.contributor.author
Aeppli, Meret
dc.contributor.author
Kaegi, Ralf
dc.contributor.author
Kretzschmar, Ruben
dc.contributor.author
Voegelin, Andreas
dc.contributor.author
Hofstetter, Thomas B.
dc.contributor.author
Sander, Michael
dc.date.accessioned
2019-04-18T13:08:07Z
dc.date.available
2019-04-18T01:02:54Z
dc.date.available
2019-04-18T13:08:07Z
dc.date.issued
2019-04-02
dc.identifier.issn
0013-936X
dc.identifier.issn
1520-5851
dc.identifier.other
10.1021/acs.est.8b07190
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/338554
dc.identifier.doi
10.3929/ethz-b-000338554
dc.description.abstract
Electron transfer to ferric iron in (oxyhydr-)oxides (hereafter iron oxides) is a critical step in many processes that are central to the biogeochemical cycling of elements and to pollutant dynamics. Understanding these processes requires analytical approaches that allow for characterizing the reactivity of iron oxides toward reduction under controlled thermodynamic boundary conditions. Here, we used mediated electrochemical reduction (MER) to follow changes in iron oxide reduction extents and rates during abiotic ferrous iron-induced transformation of six-line ferrihydrite. Transformation experiments (10 mM ferrihydrite-FeIII) were conducted over a range of solution conditions (pHtrans = 6.50 to 7.50 at 5 mM Fe2+ and for pHtrans = 7.00 also at 1 mM Fe2+) that resulted in the transformation of ferrihydrite into thermodynamically more stable goethite or magnetite. The changes in iron oxide mineralogy during the transformations were quantified using X-ray diffraction analysis. MER measurements on iron oxide suspension aliquots collected during the transformations were performed over a range of pHMER at constant applied reduction potential. The extents and rates of iron oxide reduction in MER decreased with decreasing reaction driving force resulting from both increasing pHMER and increasing transformation of ferrihydrite into thermodynamically more stable iron oxides. We show that the decreases in iron oxide reduction extents and rates during ferrihydrite transformations can be linked to the concurrent changes in iron oxide mineralogy.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Chemical Society (ACS)
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.title
Electrochemical Analysis of Changes in Iron Oxide Reducibility during Abiotic Ferrihydrite Transformation into Goethite and Magnetite
en_US
dc.type
Journal Article
dc.rights.license
In Copyright - Non-Commercial Use Permitted
dc.date.published
2019-02-13
ethz.journal.title
Environmental Science & Technology
ethz.journal.volume
53
en_US
ethz.journal.issue
7
en_US
ethz.journal.abbreviated
Environ. Sci. Technol.
ethz.pages.start
3568
en_US
ethz.pages.end
3578
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2019-04-18T01:02:56Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-04-18T13:08:32Z
ethz.rosetta.lastUpdated
2019-04-18T13:08:32Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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