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Immobilization of Cu and As in two contaminated soils with zero-valent iron – Long-term performance and mechanisms

hal.structure.identifierDepartement of Soil and Environment
hal.structure.identifierSwedish Geotechnical Institute
dc.contributor.authorTIBERG, Charlotta
hal.structure.identifierLuleå University of Technology = Luleå Tekniska Universitet [LUT]
dc.contributor.authorKUMPIENE, Jurate
hal.structure.identifierDepartement of Soil and Environment
hal.structure.identifierKTH Royal Institute of Technology [Stockholm] [KTH ]
dc.contributor.authorGUSTAFSSON, Jon Petter
hal.structure.identifierDepartement of Soil and Environment
dc.contributor.authorMARSZ, Aleksandra
hal.structure.identifierSwedish University of Agricultural Sciences = Sveriges lantbruksuniversitet [SLU]
dc.contributor.authorPERSSON, Ingmar
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorMENCH, Michel
hal.structure.identifierDepartement of Soil and Environment
hal.structure.identifierSwedish Geotechnical Institute
dc.contributor.authorKLEJA, Dan B.
dc.date.issued2016
dc.identifier.issn0883-2927
dc.description.abstractEnImmobilization of trace elements in contaminated soils by zero-valent iron (ZVI) is a promising remediation method, but questions about its long-term performance remain unanswered. To quantify immobilization and predict possible contaminant remobilization on long timescales detailed knowledge about immobilization mechanisms is needed. This study aimed at assessing the long-term effect of ZVI amendments on dissolved copper and arsenic in contaminated soils, at exploring the immobilization mechanism(s), and at setting up a geochemical model able to estimate dissolved copper and arsenic under different scenarios. Samples from untreated and ZVI-treated plots in two field experiments where ZVI had been added 6 and 15 years ago were investigated by a combination of batch experiments, geochemical modeling and extended X-ray absorption fine structure (EXAFS) spectroscopy. Dissolved copper and arsenic concentrations were described by a multisurface geochemical model with surface complexation reactions, verified by EXAFS. The ZVI remained "reactive" after 6-15 years, i. e. the dissolved concentrations of copper and arsenic were lower in the ZVI-treated than in the untreated soils. There was a shift in copper speciation from organic matter complexes in the untreated soil to surface complexes with iron (hydr)oxides in the ZVI-treated soil. The pH value was important for copper immobilization and ZVI did not have a stabilizing effect if pH was lower than about 6. Immobilization of arsenic was slightly pH-dependent and sensitive to the competition with phosphate. If phosphate was ignored in the modeling, the dissolution of arsenate was greatly underestimated.
dc.language.isoen
dc.publisherElsevier
dc.subjectcopper
dc.subjectZVI
dc.subjectsurface complexation model
dc.subject.enarsenic
dc.subject.enzero-valent iron
dc.subject.eniron (hydr)oxide
dc.subject.enimmobilization
dc.subject.enstabilization
dc.subject.encontaminated soil
dc.subject.engeochemical modeling
dc.subject.enremediation
dc.subject.enEXAFS spectroscopy
dc.subject.enX-ray absorption spectroscopy
dc.title.enImmobilization of Cu and As in two contaminated soils with zero-valent iron – Long-term performance and mechanisms
dc.typeArticle de revue
dc.identifier.doi10.1016/j.apgeochem.2016.02.009
dc.subject.halSciences du Vivant [q-bio]
bordeaux.journalApplied Geochemistry
bordeaux.page144-152
bordeaux.volume67
bordeaux.peerReviewedoui
hal.identifierhal-02635211
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02635211v1
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