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dc.contributor.author
Kretzschmar, Ruben
dc.contributor.author
Gilli, Robin S.
dc.contributor.author
Karlen, Claudine
dc.contributor.author
Weber, Mischa
dc.contributor.author
Rüegg, Johanna
dc.contributor.author
Barmettler, Kurt
dc.contributor.author
Biester, Harald
dc.contributor.author
Boivin, Pascal
dc.date.accessioned
2018-12-10T10:11:27Z
dc.date.available
2018-12-10T08:59:08Z
dc.date.available
2018-12-10T10:11:27Z
dc.date.issued
2018-07-30
dc.identifier.other
10.3390/soilsystems2030044
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/309572
dc.identifier.doi
10.3929/ethz-b-000309572
dc.description.abstract
Legacy contamination of soils and sediments with mercury (Hg) can pose serious threats to the environment and to human health. Assessing risks and possible remediation strategies must consider the chemical forms of Hg, as different Hg species exhibit vastly different environmental behaviors and toxicities. Here, we present a study on Hg speciation and potential mobility in sediments from a chemical factory site, and soils from nearby settlement areas in the canton of Valais, Switzerland. Total Hg ranged from 0.5 to 28.4 mg/kg in the soils, and 3.5 to 174.7 mg/kg in the sediments, respectively. Elemental Hg(0) was not detectable in the soils by thermal desorption analysis. Methylmercury, the most toxic form of Hg, was present at low levels in all soils (<0.010 mg/kg; <0.8% of total Hg). Sequential extractions and thermal desorption analyses suggested that most of the Hg in the soils was present as “matrix-bound Hg(II)”, most likely associated with soil organic matter. For factory sediments, which contained less organic matter, the results suggested a higher fraction of sulfide-bound Hg. Batch extractions in different CaCl2 solutions revealed that Hg solubility was low overall, and there was no Hg-mobilizing effects of Ca2+ or Cl− in solution. Only in some of the factory sediments did high CaCl2 concentrations result in increased extractability of Hg, due to the formation of Hg-chloride complexes. Additional experiments with soil redox reactors showed that even mildly reducing conditions led to a sharp release of Hg into solution, which may be highly relevant in soils that are prone to periodic water saturation of flooding.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
MDPI
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
mercury
en_US
dc.subject
pollution
en_US
dc.subject
contamination
en_US
dc.subject
toxicity
en_US
dc.subject
risk assessment
en_US
dc.subject
solubility
en_US
dc.subject
extraction
en_US
dc.subject
redox
en_US
dc.title
Speciation and mobility of mercury in soils contaminated by legacy emissions from a chemical factory in the Rhone Valley in Canton of Valais, Switzerland
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Soil Systems
ethz.journal.volume
2
en_US
ethz.journal.issue
3
en_US
ethz.pages.start
44
en_US
ethz.size
22 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.publication.place
Basel
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
en_US
ethz.date.deposited
2018-12-10T08:59:11Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2018-12-10T10:11:36Z
ethz.rosetta.lastUpdated
2021-02-15T03:00:27Z
ethz.rosetta.versionExported
true
ethz.COinS
ctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.atitle=Speciation%20and%20mobility%20of%20mercury%20in%20soils%20contaminated%20by%20legacy%20emissions%20from%20a%20chemical%20factory%20in%20the%20Rhone%20Valley%20in%20Canto&amp;rft.jtitle=Soil%20Systems&amp;rft.date=2018-07-30&amp;rft.volume=2&amp;rft.issue=3&amp;rft.spage=44&amp;rft.au=Kretzschmar,%20Ruben&amp;Gilli,%20Robin%20S.&amp;Karlen,%20Claudine&amp;Weber,%20Mischa&amp;R%C3%BCegg,%20Johanna&amp;rft.genre=article&amp;rft_id=info:doi/10.3390/soilsystems2030044&amp;
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