Community Research and Development Information Service - CORDIS


Surface samples of lake varese sediments, collected in1993 along with samples of overlying water and pore water, have been analyzed for 20 elements. The results, compared to data from previous sampling in 1985, indicate an increase in carbonate elements and organic matter, and a decrease in the conservative elements. Also two of the mobile elements have increased, but Fe decreased, as a result of the long period of anoxia of the sediments either increase, or present a small decrease, but still the concentrations are high enough to classify the sediment as highly polluted. However, the relatively low concentrations of metals in overlying water and pore water indicate that only a small fraction of these elements should be easily bioavailable; hence, it is very likely that they do not constitute a possible risk for the aquatic biota.

Additional information

Authors: CENCI R M, EI, JRC-Ispra (IT);BO F, EI, JRC-Ispra (IT);BARBERO S, EI, JRC-Ispra (IT)
Bibliographic Reference: EUR 19000 EN (1999), 41pp.
Availability: Available free of charge from CCR Ispra (IT)
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