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curriculum in natural environmental science, vol. 2, 2010

Potential environmental risks from sediment-bound trace elements: A case study from the Ukrainian part of the Danube Delta Davide Vignati 1 and Nikolai Berlinsky 2 1) Istituto di Ricerca Sulle Acque – Consiglio Nazionale delle Ricerche , Brugherio (Milan), Italy

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curriculum in natural environmental science, vol. 2, 2010

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  1. Potential environmental risks from sediment-bound trace elements:A case study from the Ukrainian part of the Danube Delta Davide Vignati1 and Nikolai Berlinsky2 1) Istituto di RicercaSulleAcque – ConsiglioNazionale delle Ricerche, Brugherio (Milan), Italy 2) Odessa State Environmental University, Odessa, Ukraine curriculumin natural environmental science, vol. 2, 2010

  2. Summary • Sediments are sinks for contaminants • Dredging works can remobilize contaminants • Dredging works in Danube Delta in May 2004 • How to evaluate potential metal toxicity?

  3. Sampling sites (dredging May 2004) The Danube basin (1) The sampling area and dredging sites The Danube delta (2) • From Wikimedia commons. Public Domain, created by the United States Federal Government • From Wikimedia commons. Public Domain; created by NASA

  4. < TEC = < TEC > PEC = > PEC = Evaluation of potential toxicity TEC = Threshold Effect Concentration PEC = Probable Effect Concentration Element concentrations

  5. Concentrations vs. TEC and PEC in Danube Copper

  6. Concentrations vs. TEC and PEC in Danube Lead

  7. Concentrations vs. TEC and PEC in Danube Mercury

  8. Concentrations vs. TEC and PEC in Danube Arsenic

  9. Conclusions and questions for discussion • Exceedance of TECs (PECs) occurs • Biological effects? • Combined metal effects (see main text) • Seasonal variability? • Hydrological variability? • Biological investigations needed • Laboratory tests? • Field studies? • Some sediments may pose risks to biota

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