Mercury transport and speciation during electrokinetic soil remediation
2003 (English)In: Water, Air and Soil Pollution, ISSN 0049-6979, Vol. 143, no 1-4, 99-109 p.Article in journal (Refereed) Published
A 30 V direct electric field was applied to a contaminated soil from a chlor-alkali plant for 182 days. The principal soil contaminats were mercury, polchlorinated dibenzofurans, and lead. When chloride was added to the soil, mercury moved towards the cathode, showing that anionic mercury chloride complexes did not dominate. When iodide was added to the soil solution, mercury moved towards the anode, illustrating the predominance of an anionic mercury iodide complex. The iodide mobilised mercury from the soil and transported it rapidly into the anode solution, so that mercury was removed from the soil. When the experiment was continued, mercury returned to a cationic form and electromigration transported the mercury back into the soil. This was probably due to the lower iodide concntrations that may result from the oxidation of iodide to iodine near the anode. Sequential extraction showed that mercury was strongly bound to the soil, both before and after the electrokinetic treatment. The heavy metals were found in the 'acidic and oxidising', and the residual fraction of the leaching procedure. Mercury was more available after the treatment with iodide.
Place, publisher, year, edition, pages
2003. Vol. 143, no 1-4, 99-109 p.
electrokinetics, iodide, mercury, soil remediation, soil treatment, speciation
IdentifiersURN: urn:nbn:se:liu:diva-48664OAI: oai:DiVA.org:liu-48664DiVA: diva2:269560