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Impact of water saturation level on arsenic and metal mobility in the Fe-amended soil
Division of Waste Science and Technology, Luleå University of Technology, SE- 97187 Luleå, Sweden.
Swedish Defence Research Agency, Umeå, Sweden.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2009 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 74, no 2, 206-215 p.Article in journal (Refereed) Published
Abstract [en]

The impact of water saturation level (oxidizing-reducing environment) on As and metal solubility in chromium, copper, arsenic (CCA)-contaminated soil amended with Fe-containing materials was studied. The soil was mixed with 0.1 and 1 wt% of iron grit (Fe(0)) and 1, 7 and 15 wt% of oxygen scarfing granulate (OSG, a by-product of steel processing). Solubility of As and metals was evaluated by a batch leaching test and analysis of soil pore water. Soil saturation with water greatly increased As solubility in the untreated as well as in the Fe-amended soil. This was related to the reductive dissolution of Fe oxides and increased concentration of As(III) species. Fe amendments showed As reducing capacity under both oxic and anoxic conditions. The cytotoxicity of the soil pore water correlated with the concentration of As(III). The Fe-treatments as well as water saturation of soil were less significant for the solubility of Cu, Cr and Zn than for As. The batch leaching test used for waste characterization substantially underestimated As solubility that could occur under water-saturated (anaerobic) conditions. In the case of soil landfilling, other techniques than Fe-stabilization of As containing soil should be considered.

Place, publisher, year, edition, pages
Elsevier, 2009. Vol. 74, no 2, 206-215 p.
Keyword [en]
Zerovalent iron, Magnetite, Chromium copper arsenic (CCA), Arsenic speciation, Basal cytotoxicity
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-10986DOI: 10.1016/j.chemosphere.2008.09.068OAI: oai:DiVA.org:umu-10986DiVA: diva2:150657
Available from: 2008-12-02 Created: 2008-12-02 Last updated: 2012-06-15Bibliographically approved

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CiteExportLink to record
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