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dc.contributor.author
Huang, Hui
dc.contributor.author
Chen, Hong-Ping
dc.contributor.author
Kopittke, Peter M.
dc.contributor.author
Kretzschmar, Ruben
dc.contributor.author
Zhao, Fang-Jie
dc.contributor.author
Wang, Peng
dc.date.accessioned
2022-01-03T09:58:32Z
dc.date.available
2021-03-03T08:33:36Z
dc.date.available
2021-03-03T16:28:03Z
dc.date.available
2022-01-03T09:58:32Z
dc.date.issued
2021-02-02
dc.identifier.issn
0013-936X
dc.identifier.issn
1520-5851
dc.identifier.other
10.1021/acs.est.0c06561
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/472644
dc.description.abstract
Excessive cadmium (Cd) accumulation in rice grain is a global issue that affects human health. The drainage of paddy soils during the grain filling period leads to the remobilization of Cd in soils, resulting in most of the Cd accumulated in rice grain. The rate of Cd remobilization during drainage differs markedly among soils, but the mechanisms underlying these differences remain largely unknown. Using microcosm soil incubation, electrochemical experiments, isotope labeling, and microscopic and spectroscopic analyses, here, we discover the voltaic effect as a novel mechanism controlling the remobilization of Cd during soil drainage. During soil flooding, microbial sulfate reduction results in the formation of various metal sulfides. When the soils are subsequently drained, the various metal sulfides can form within sulfide voltaic cells. The metal sulfides with a lower electrochemical potential act as anodes and are prone to oxidative dissolution, whereas the metal sulfides with a higher potential act as cathodes and are protected from oxidation. This voltaic effect explains why the presence of ZnS (with a low potential) suppresses the oxidative dissolution of Cd sulfides, whereas the presence of CuS (with a high potential) promotes the oxidative dissolution of Cd sulfides. The voltaic effect is applicable to all chalcophile trace metals coupled with the sulfur redox cycle in periodically anoxic–oxic environments, thus playing an important role in the biogeochemistry of trace metals. © 2021 American Chemical Society
en_US
dc.language.iso
en
en_US
dc.publisher
American Chemical Society
en_US
dc.title
The Voltaic Effect as a Novel Mechanism Controlling the Remobilization of Cadmium in Paddy Soils during Drainage
en_US
dc.type
Journal Article
dc.date.published
2021-01-25
ethz.journal.title
Environmental Science & Technology
ethz.journal.volume
55
en_US
ethz.journal.issue
3
en_US
ethz.journal.abbreviated
Environ. Sci. Technol.
ethz.pages.start
1750
en_US
ethz.pages.end
1758
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02721 - Inst. f. Biogeochemie u. Schadstoffdyn. / Inst. Biogeochem. and Pollutant Dynamics::03541 - Kretzschmar, Ruben / Kretzschmar, Ruben
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02721 - Inst. f. Biogeochemie u. Schadstoffdyn. / Inst. Biogeochem. and Pollutant Dynamics::03541 - Kretzschmar, Ruben / Kretzschmar, Ruben
ethz.date.deposited
2021-03-03T08:33:56Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-03-03T16:28:13Z
ethz.rosetta.lastUpdated
2022-03-29T17:11:37Z
ethz.rosetta.versionExported
true
ethz.COinS
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