Speciation of heavy metals in bottom sediments of lakes in the area of Wielkopolski National Park

This paper reports results of speciation analysis of selected heavy metals (Fe, Mn, Zn, Ni, Cu, Pb, Cd) in bottom sediment samples collected from 11 l akes in the area of Wielkopolski National Park, which is a protected area s ubjected to limited anthropogenic factors, The main aim of the study was de termination of the distribution of the metals among five speciaiton forms d efined by Tessier: exchangeable, bound to carbonates, bound to hydrated oxi des of iron and manganese, bound to organic matter and others. The particul ar forms were isolated by sequential extraction.