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The processes deriving from meteorological processes and human activities are the principal causes of the accumulation of trace elements in lake sediments. This study has attempted to evaluate by sequential extraction proposed by the Community Reference Bureau (BCR) of the European Commission, the potential mobility of Cadmium and Lead in the sediments from two reservoirs, Flumendosa and Mulargia, in Sardinia

In the superficial sediments, taken by grab sampling, the procedure of sequential extraction proposed by the BCR, that has 3 steps that permit the extraction of 3 metal fractions. Cadmium and lead are present in high concentrations in this ecosystem, and these elements were analysed by Atomic Absorption Spectrophotometry (AAS).

In general, the highest concentrations for the two elements were found to occur in the Flumendosa reservoir.

The mean concentrations of cadmium in fraction 1 (more easily extractable) are 6.7 mg/kg for Flumendosa and 0.94 mg/kg for Mulargia sediment. In fraction 2 are respectively 0.82 and 0.09 mg/kg in fraction 3 (less easily extractable) the values are 2.8 and 0.2 mg/kg respectively. Concerning lead, the average concentratios in fraction 1 are respectively 92.1 and 8.9 mg/kg, in fraction 2 17.4 and 10.2 mg/kg. In fraction 3 the concentrations are 97.4 and 15.7 mg/kg.

THe results obtained have been used to construct maps of the distribution of the concentrations of these elements and have permitted the exclusion of high level release of lead and cadmium for the sediments of the two lakes studied. This low release of two elements is advantageous for water quality and the biological communities living in these lakes.

Additional information

Authors: CENCI R M, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);MUNTAU H, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);BIANCHI M, ECOCONSULT, Gavirate (IT)
Bibliographic Reference: EUR 21014 IT (2004), Various paging. Free of charge
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9843 or +39-033278-9864 Fax: +39-033278-9623 E-mail:
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