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Soil Analysis of Volunteer Wetland: Evaluating Metal Retention in Substrate

This study investigates whether the substrate in a volunteer wetland acts as a sink for soluble metals from mine water discharge. Comprehensive field and laboratory methods were employed, including sample collection using auger and slide hammer techniques, and analysis of pH, moisture content, bulk density, and total metal concentrations. Results indicated elevated surface iron concentrations while subsurface levels aligned with background levels. Zinc concentrations mirrored those of iron. These findings highlight the wetland's potential for long-term metal retention, guiding future metal analysis research.

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Soil Analysis of Volunteer Wetland: Evaluating Metal Retention in Substrate

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  1. Soil Analysis Of A Volunteer Wetland Danette Miller Advisors: Dr. Nairn and Dr. Strevett University of Oklahoma

  2. Overview • Importance of substrate • Field methods • Laboratory methods • Analysis • Results • Conclusions

  3. Substrate • Sink • Long term retention of metals • Types • Organic • Mineral

  4. Problem Statement • Is the substrate in the volunteer wetland a sink for soluble metals in the mine water discharge?

  5. Study Site

  6. Field Methods • Sample collection • Auger, slide hammer, manual extraction • Replicates • Sample storage

  7. Laboratory Methods • pH • Moisture content • Particle density • Pore space • Bulk density • Total metals • Microwave Digestion • AA spectrophotometer

  8. Results • pH • 6.08 to 7.56 • Moisture content • Surface: 55% to 86% • Subsurface: 25% to 42% • Particle density • Surface: 0.26 to 0.56 g/cm3 • Subsurface: 0.27 to 0.57 g/cm3

  9. Results • Bulk Density • Surface: 0.3 to 0.6 g/cm3 • Subsurface: ND • Total metals • Stratified trends

  10. Results: Iron (Fe) Trends

  11. Results: Zinc (Zn) Trends

  12. Conclusions • Substrate is a sink • Trends • Surface iron concentrations are elevated • Subsurface iron concentrations are similar to background levels • Zinc trends were similar to iron trends

  13. Future Research • Additional metals • Pb, Cd • Available metals • metal concentration available for biomass uptake

  14. Acknowledgements • NSF • Dr. Nairn and Dr. Strevett • REU lab research crew • Carrie Evenson and Jane Sund • Jacob Manko and Todd Wolfard • Erin Breetzke and Lisa Hare • Sharon and Janna Robbins • Wetland Willy

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