engleski

Determination of total heavy metal by sequential extraction from soil

Understanding the chemical speciation of metals in solution is necessary for evaluating their toxicity and mobility in soils. Sequential extraction of metals from soil, based on the Tessier’s procedure, was used to evaluate soil contamination in the Bhilai Industrial area. The contents of Al, As, Cd, Cu, Fe, Mn, Pb, Zn in the five fractions (exchangeable, bound to carbonates, bound to iron and manganese oxide, bound to organic matter and residual) were determined by ICP-AES and HG-ICP-AES. A higher fraction of metals i.e. As, Cu, Mn and Pb were found in the bound form with oxide and sulfide of Fe. A major fraction of all metals were found to be present in the carbonate forms in increasing order: As = Cr < Ni = Mn < Hg < Pb < Fe < Cu < Zn in the soil. The contents of Cu in the exchangeable fraction exceeded the normal values for sensitive soil.

sequential extraction procedure; metal partitioning in soil; heavy metals; soil contamination

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