Zinc species distribution in EDTA-extract residues of zinc-contaminated soil
نویسندگان
چکیده
Soil sample from a site heavily contaminated with >10 wt.% zinc is sampled and extracted with aqueous solutions of ethylene diamine tetra-acetic cid (EDTA) that is a reagent frequently used to extract heavy metals in soil remediation. Three liquid/soil ratios (5/1, 20/1, and 100/1) were used n the extracting experiment. The molecular environment of the residual Zn in the EDTA-extract residues of zinc-contaminated soil is investigated ith XANES technique. The results indicate that EDTA does not show considerable preference of chelating for any particular Zn species during he extraction. Zn species distribution in the sampled soil is found to resemble that in all EDTA-extract residues; Zn(OH)2 is determined as the ajor zinc species (60–70%), seconded by organic zinc (21–26%) and zinc oxide (9–14%). 2006 Elsevier B.V. All rights reserved.
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