Assessment of heavy metal contamination in paddy soils from Kocani Field (Republic of Macedonia): part II

摘要

The identification of heavy metals (Ag, As, Cd, Cu, Mo, Ni, Pb, Sb and Zn) mobility and availability in Kocani paddy soils was evaluated by sequential extraction procedure. According to the sum of the water soluble and exchangeable fractions for Ag, As, Cd, Cu, Mo, Ni, Pb, Sb and Zn measured in the paddy soils at Kocani Field, the mobility and bioavailability potential of the heavy metals studied declined in the following order: Cd > Mo > Sb > Zn > Cu > As > Pb > Ni > Ag. Cd was consistently bound to bioavailable and leachable fractions, as were Mo and Sb, which were also significantly present in the oxidisable fraction. Cu and As were mostly linked to the oxidisable fraction, indicating relative mobility under oxidising conditions. The reducible and reducible / residual fractions prevailed for Zn, Pb, Ni, and Ag, signifying a relatively low mobility capacity.