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Immobilization of C...
Immobilization of Cu and As in two contaminated soils with zero-valent iron - Long-term performance and mechanisms
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- Tiberg, Charlotta (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment,Swedish Geotechnical Institute (SGI)
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- Kumpiene, Jurate (författare)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Gustafsson, Jon Petter (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,KTH,Mark- och vattenteknik,Department of Land and Water Resources Engineering, Royal Institute of Technology, Department of Soil and Environment, Swedish University of Agricultural Sciences,Institutionen för mark och miljö,Department of Soil and Environment,Royal Institute of Technology (KTH)
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- Marsz, Aleksandra (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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- Persson, Ingmar (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för Kemi och Bioteknologi,The Department of Chemistry and Biotechnology
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- Mench, Michel (författare)
- Bordeaux University, UMR BIOGECO INRA 1202, Ecology of Communities, Bordeaux 1 University
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- Berggren Kleja, Dan (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment,Swedish Geotechnical Institute (SGI)
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(creator_code:org_t)
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- Elsevier, 2016
- 2016
- Engelska.
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Ingår i: Applied Geochemistry. - : Elsevier. - 0883-2927 .- 1872-9134. ; 67, s. 144-152
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Abstract
Ämnesord
Stäng
- Immobilization 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. (C) 2016 Elsevier Ltd. All rights reserved.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik -- Annan naturresursteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering -- Other Environmental Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik -- Miljöledning (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering -- Environmental Management (hsv//eng)
Nyckelord
- Copper
- Arsenic
- ZVI
- Zero-valent iron
- Iron (hydr)oxide
- Immobilization
- Stabilization
- Contaminated soil
- Remediation
- Geochemical modeling
- Surface complexation model
- EXAFS spectroscopy
- X-ray absorption spectroscopy
- Avfallsteknik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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