Assessment of metal mobility from sediment of lake vegoritis

Abstract

Abstract In the framework of an extended study on the environmental contamination status of lake Vegoritis relatively high chromium and nickel concentrations were detected during the early stages of the investigation. The question whether these metals reached the lake due to anthropogenic activities or associated with elevated geochemical backgrounds, was not answered satisfactorily and therefore a sequential extraction technique was used to determine the chemical association of the heavy metals Pb, Cd, Zn, Cu, Cr and Ni. The methodology applied, the so called EC‐Common procedure, was developed jointly by the BCR Brussels and the Joint Research Centre, Ispra, in collaboration with the University of Barcelona and the Macauley‐Institute. Four metal fractions of the total concentration were distinguished: The easily exchangeable and carbonate bound fractions The fraction associated with easily and moderately reducible iron and manganese compounds The fraction associated with the organic matter and sulfides a...