title: Monitoring the effects of chelating agents and electrical fields on active forms of Pb and Zn in contaminated soil.
abstract: The application of electrical fields and chelating agents is an innovative hybrid technology used for the decontamination of soil polluted by heavy metals. The effects of four center-oriented electrical fields and chelating agents on active fractions of lead and zinc were investigated in this pot experiment. Ethylenediaminetetraacetic acid (EDTA) as a synthetic chelator and cow manure extract (CME) and poultry manure extract (PME) as natural chelators were applied to the pots (2 g kg(-1)) 30 days after the first irrigation. Two weeks later, four center-oriented electrical fields were applied in each pot (in three levels of 0, 10, and 30 V) for 1 h each day for 14 days. The soil near the cathode and anodes was collected and analyzed as cathodic and anodic soil, respectively. Results indicated that the soluble-exchangeable fraction of lead and zinc were decreased in the cathodic soil, while the carbonate-bound fractions were increased. In the anodic soil, however, the opposite result was observed. EDTA enhanced the soluble-exchangeable form of the metals in both anodic and cathodic soils. Furthermore, the amounts of carbonate-bound heavy metals were increased by the application of CME in both soils. The organic-bound fraction of the metals was increased by the application of natural chelators, while electrical fields had no significant impacts on this fraction.
authors.affiliation: Department of soil science, Bu-Ali Sina University, Hamadan, Iran, i.tahmasbian@basu.ac.ir.
authors.forename: Iman
authors.initials: I
authors.lastname: Tahmasbian
authors.forename: Ali Akbar
authors.initials: AA
authors.lastname: Safari Sinegani
mesh_terms: D000818:Animals; D002614:Chelating Agents / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry; D004574:Electromagnetic Fields; D004784:Environmental Monitoring; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007854:Lead / Q000032:analysis / Q000737:chemistry*; D008372:Manure; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D008956:Models, Chemical; D012987:Soil / Q000737:chemistry*; D015032:Zinc / Q000032:analysis / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D008372:Manure; D019216:Metals, Heavy; D012987:Soil; D007854:Lead; D004492:Edetic Acid; D015032:Zinc