Journal
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
Volume 88, Issue 6, Pages 385-396Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/03067310701744283
Keywords
single extraction; EDTA; soil; lead; Pb-isotope ratio; contamination
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Among many single-step extraction procedures proposed, 0.05M EDTA (ethylenediaminetetraacetic acid) extraction is widely used. Although it has been often criticised, this protocol remains an effective and simple approach for a fast determination of the potential availability of several metals (e.g., Pb, Cd, Cu, Zn, etc.). However, other metallic elements present in soils at high concentrations such as Ca and Fe can possibly influence the extraction of the target metal due to competition for the EDTA ligand. The aim of this study was to evaluate the role of these metals during the 0.05M EDTA extraction procedure. Furthermore, sequential extraction and Pb isotope analyses ((206/207) Pb) were used in order to obtain more detailed information. The results of this study showed that especially the concentration and crystallinity of Fe play a very important role during the extraction of the target metals from low to moderately contaminated soils and this fact should be taken into account during result interpretation.
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