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Hydrobiologia

, Volume 176, Issue 1, pp 213–223 | Cite as

Distribution of nutrients, trace elements, PAHs and radionuclides in sediment cores from Lake Varese (N. Italy)

  • A. Provini
  • G. Premazzi
  • S. Galassi
  • G. F. Gaggino
Contaminant accumulation, distributions, geochemistry and minerology

Abstract

Sediment cores were collected at 5 stations in Lake Varese. They were analyzed for organic matter, N, P, organic C, Cd, Cr, Cu, Hg, Pb, Zn and PAHs. A sedimentological approach has been applied to estimate the ecological risk from identified pollutants.

As in other eutrophic lakes in Northern Italy, this lake is also at considerable risk from heavy metal pollution. Cr, Cu and Cd showed the highest enrichment factors for the last 5 years, 23.4, 8.0 and 7.6 respectively. Other metals had enrichment factors ranging from 1 to 3. Fluoranthene was chosen as a representative PAH, derived from combustion products; its average value in surficial sediments ranged from 100 to 220 ng l-1 dw. This compound can be a hazard to human health and aquatic life. An evaluation of radionuclide distributions after the recent Chernobyl accident in the USSR (134Cs, 137C s, 131I, 106Ru) provided useful tracers to follow the cycling of pollutants bound to particulate matter in the aquatic ecosystem.

Key words

sediments heavy metals PAHs Lake Varese 

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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • A. Provini
    • 1
  • G. Premazzi
    • 2
  • S. Galassi
    • 1
  • G. F. Gaggino
    • 1
  1. 1.Water Research Institute (IRSA)BrugherioItaly
  2. 2.CEC Joint Research Centre-21021IspraItaly

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