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Xu, Jingying; Kleja, Dan B.; Biester, Harald; Lagerkvist, Anders; Kumpiene, Jurate
Chemosphere (Oxford), 08/2014, Letnik: 109Journal Article
•Neither pH adjustment nor chloride introduction facilitated Hg removal from soil.•No correlation was found between Hg and total/dissolved soil organic matter.•Hg was firmly bound to soil making washing insufficient for soil clean-up. Feasibility of soil washing to remediate Hg contaminated soil was studied. Dry sieving was performed to evaluate Hg distribution in soil particle size fractions. The influence of dissolved organic matter and chlorides on Hg dissolution was assessed by batch leaching tests. Mercury mobilization in the pH range of 3–11 was studied by pH-static titration. Results showed infeasibility of physical separation via dry sieving, as the least contaminated fraction exceeded the Swedish generic guideline value for Hg in soils. Soluble Hg did not correlate with dissolved organic carbon in the water leachate. The highest Hg dissolution was achieved at pH 5 and 11, reaching up to 0.3% of the total Hg. The pH adjustment was therefore not sufficient for the Hg removal to acceptable levels. Chlorides did not facilitate Hg mobilization under acidic pH either. Mercury was firmly bound in the studied soil thus soil washing might be insufficient method to treat the studied soil.
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