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Pakistan Journal of Biological Sciences
Year: 2006  |  Volume: 9  |  Issue: 5  |  Page No.: 837 - 842

An Experimental Study of Heavy Metal Extraction, Using Various Concentration of EDTA in a Sandy Loam Soils

D. Naghipoor Khalkhaliani, A.R. Mesdaghinia, A.H. Mahvi, J. Nouri and F. Vaezi    

Abstract: This study provides an evaluation of EDTA solution for the removal of lead, zinc and cadmium from a contaminated soil. The field soil contained 68% sand, 12% clay and 20% silt. The performance of EDTA for the treatment of soil contaminated with heavy metals was evaluated in this study. Soil samples containing variable levels of Pb, Zn, Cd were subjected to Ethylene Diamin Tetra-acetic Acid (EDTA) treatment and the extraction of heavy metals was found to vary, ranging from 54.5 to 100%. Thus the feasibility of soil washing for the decontaminated sandy-loam soil with single and several metals were evaluated in laboratory-scale batch experiments. Of the washing reagent test, Na2- EDTA 0.1 M solutions were generally more effective for removing heavy metals from soils. Na2-EDTA 0.1M preferentially extracted lead over cadmium and zinc. The most efficient washing occurred using the 0.1M EDTA at the lowest pH.

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