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Zn Ecotoxicological Endpoints in Metal Contaminated Soils

Zn Ecotoxicological Endpoints in Metal Contaminated Soils. Gary Pierzynski, Arline Novak, and Walter Fick Kansas State University. Objectives. Assess the potential for Zn phytotoxicity in the Tri-State Mining region through field and greenhouse studies

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Zn Ecotoxicological Endpoints in Metal Contaminated Soils

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  1. Zn Ecotoxicological Endpoints in Metal Contaminated Soils Gary Pierzynski, Arline Novak, and Walter Fick Kansas State University

  2. Objectives • Assess the potential for Zn phytotoxicity in the Tri-State Mining region through field and greenhouse studies • Evaluate the use of diffusive gradients in thin film (DGT) for the assessment of Zn bioavailability to plants

  3. Methods – Field Study • Eight 100 m transects laid out in areas impacted by mine wastes • Plant community structure was assessed every 5 m in 0.5 m2 frames in June 2002 • Species identification • Relative abundance of each species • Soil samples collected from 0-5 and 5-10 cm around perimeter of each frame • Biomass production determined every 10 m in October 2002

  4. Methods – Greenhouse • Sand/nutrient cultures • Zn sources: ZnSO4, chat, smelter slag • Zn sources mixed with sand to provide a wide range of Zn concentrations • Big bluestem, pigweed, switchgrass • Zn bioavailability assessed with DGT and 0.1 M Ca(NO3)2 extraction

  5. Chat - Pigweed ZnSO4 -Pigweed

  6. Chat – Big bluestem ZnSO4 – Big bluestem

  7. Chat – Big bluestem Chat - Switchgrass

  8. ZnSO4 – Big bluestem - P ZnSO4 – Big bluestem - Fe

  9. Chat – Big bluestem - P Chat – Big bluestem - Fe

  10. Critical values for 75% of control yield – Big bluestem

  11. Critical values for 75% of control yield – Pigweed

  12. Critical values for 75% of control yield – Switchgrass

  13. Conclusions • Field data suggest that Zn may play a role in species richness, species present, and biomass production. • Greenhouse data indicate Zn phytotoxicity can be induced with mine wastes. • DGT was superior to batch extractions • Further evaluation of DGT for assessment of ecotoxicologial endpoints is warranted

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