title: Removal of heavy metals from contaminated soil by electrodialytic remediation enhanced with organic acids.
abstract: The soil from an industrial area in Algeria was contaminated with Cr (8370 mg kg-1), Ni (1135 mg kg-1) and zinc (1200 mg kg-1). The electrodialytic remediation of this soil was studied using citric acid and EDTA as facilitating agents. 0.1 M citric acid or EDTA was added directly to the soil before it was introduced in an electrodialytic cell in an attempt to enhance the heavy metal solubility in the interstitial fluid. The more acidic pH in the soil when citric acid was used as the facilitating agent was not enough to mobilize and remove the metals from the soil. Only 7.2% of Ni and 6.7% of Zn were removed from the soil in the test with citric acid. The best results were found with EDTA, which was able to solubilize and complex Zn and Ni forming negatively charged complexes that were transported and accumulated in the anolyte. Complete removal was observed for Ni and Zn in the electrodialytic treatment with EDTA. Minor amounts of Cr were removed with both EDTA and citric acid.
authors.affiliation: Centre of Research in Physical and Chemical Analysis (CRAPC), PO BOX 248, Algiers, 16004 Algeria and Laboratory of Hydrometallurgy and Inorganic Molecular Chemistry, Faculty of Chemistry, University of Sciences and Technology Houari Boumediene, USTHB PO BOX 32 El Alia Bab Ezzouar, Algiers, 16111, Algeria.
authors.forename: Ouarda
authors.initials: O
authors.lastname: Merdoud
authors.affiliation: Department of Chemical Engineering, University of Vigo, Rua Maxwell s/n. Edificio Fundicion, 36310 Vigo, Spain. claudio@uvigo.es.
authors.forename: Claudio
authors.identifier: http://orcid.org/0000-0003-4785-1585
authors.initials: C
authors.lastname: Cameselle
authors.affiliation: Laboratory of Hydrometallurgy and Inorganic Molecular Chemistry, Faculty of Chemistry, University of Sciences and Technology Houari Boumediene, USTHB PO BOX 32 El Alia Bab Ezzouar, Algiers, 16111, Algeria.
authors.forename: Mohamed Oualid
authors.initials: MO
authors.lastname: Boulakradeche
authors.affiliation: Laboratory of Hydrometallurgy and Inorganic Molecular Chemistry, Faculty of Chemistry, University of Sciences and Technology Houari Boumediene, USTHB PO BOX 32 El Alia Bab Ezzouar, Algiers, 16111, Algeria.
authors.forename: Djamal Eddine
authors.initials: DE
authors.lastname: Akretche
mesh_terms: D000462:Algeria; D019343:Citric Acid / Q000737:chemistry; D004492:Edetic Acid / Q000737:chemistry; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000032:analysis / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*
chemical_list: D019216:Metals, Heavy; D012987:Soil; D012989:Soil Pollutants; D019343:Citric Acid; D004492:Edetic Acid