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This study has established a comparative picture of recent sedimentation and degree of contamination due to nutrients and heavy metals in four lakes of northern Italy. Twenty sediment cores were collected from accumulation areas of each lake. Sampling depths ranged from 3 meters to 65 meters. Sedimentation rates, evaluated by the Cs-137 technique, varied from 0.9 to 3 cm/year. In the last ten years enrichment factors for nutrients ranged from 0.4 to 3; while the degree of contamination by trace metals was in the range 8.4 to 27.2. The sedimentology approach was applied to evaluate the level of risk incurred by the presence of heavy metals. In these aquatic environments this kind of pollution is present at a relatively moderate level of risk.

Additional information

Authors: BINDA S, JRC Ispra Estab. (IT)
Bibliographic Reference: EUR 11822 IT (1988)
Availability: (2)
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