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dc.contributor.author
Biswakarma, Jagannath
dc.contributor.author
Kang, Kyounglim
dc.contributor.author
Schenkeveld, Walter D.C.
dc.contributor.author
Kraemer, Stephan M.
dc.contributor.author
Hering, Janet G.
dc.contributor.author
Hug, Stephan J.
dc.date.accessioned
2020-02-03T10:14:11Z
dc.date.available
2020-02-03T03:42:54Z
dc.date.available
2020-02-03T10:14:11Z
dc.date.issued
2020-01-21
dc.identifier.issn
0013-936X
dc.identifier.issn
1520-5851
dc.identifier.other
10.1021/acs.est.9b04235
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/396554
dc.identifier.doi
10.3929/ethz-b-000396554
dc.description.abstract
Dissolution of Fe(III) phases is a key process in making iron available to biota and in the mobilization of associated trace elements. Recently, we have demonstrated that submicromolar concentrations of Fe(II) significantly accelerate rates of ligand-controlled dissolution of Fe(III) (hydr)oxides at circumneutral pH. Here, we extend this work by studying isotope exchange and dissolution with lepidocrocite (Lp) and goethite (Gt) in the presence of 20 or 50 μM desferrioxamine-B (DFOB). Experiments with Lp at pH 7.0 were conducted in carbonate-buffered suspensions to mimic environmental conditions. We applied a simple empirical model to determine dissolution rates and a more complex kinetic model that accounts for the observed isotope exchange and catalytic effect of Fe(II). The fate of added tracer 57Fe(II) was strongly dependent on the order of addition of 57Fe(II) and ligand. When DFOB was added first, tracer 57Fe remained in solution. When 57Fe(II) was added first, isotope exchange between surface and solution could be observed at pH 6.0 but not at pH 7.0 and 8.5 where 57Fe(II) was almost completely adsorbed. During dissolution of Lp with DFOB, ratios of released 56Fe and 57Fe were largely independent of DFOB concentrations. In the absence of DFOB, addition of phenanthroline 30 min after tracer 57Fe desorbed predominantly 56Fe(II), indicating that electron transfer from adsorbed 57Fe to 56Fe of the Lp surface occurs on a time scale of minutes to hours. In contrast, comparable experiments with Gt desorbed predominantly 57Fe(II), suggesting a longer time scale for electron transfer on the Gt surface. Our results show that addition of 1–5 μM Fe(II) leads to dynamic charge transfer between dissolved and adsorbed species and to isotope exchange at the surface, with the dissolution of Lp by ligands accelerated by up to 60-fold.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Chemical Society
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Linking Isotope Exchange with Fe(II)-Catalyzed Dissolution of Iron(hydr)oxides in the Presence of the Bacterial Siderophore Desferrioxamine-B
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2019-12-17
ethz.journal.title
Environmental Science & Technology
ethz.journal.volume
54
en_US
ethz.journal.issue
2
en_US
ethz.journal.abbreviated
Environ. Sci. Technol.
ethz.pages.start
768
en_US
ethz.pages.end
777
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
2020-02-03T03:43:05Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-02-03T10:14:22Z
ethz.rosetta.lastUpdated
2022-03-29T00:54:25Z
ethz.rosetta.versionExported
true
ethz.COinS
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