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Contaminant Metals in Boston Harbor: Processes Influencing long-term fate

Contaminant Metals in Boston Harbor: Processes Influencing long-term fate. Bill Martin Linda Kalnejais Mike Bothner. Study Site:Hingham Bay 2000 - 2008. Ag, Pb, and Cu: 1980 - 2002. Cu, Ag, and Pb. All are associated with organic matter : Cu > Ag, Pb

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Contaminant Metals in Boston Harbor: Processes Influencing long-term fate

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  1. Contaminant Metals in Boston Harbor:Processes Influencing long-term fate Bill Martin Linda Kalnejais Mike Bothner

  2. Study Site:Hingham Bay2000 - 2008

  3. Ag, Pb, and Cu:1980 - 2002

  4. Cu, Ag, and Pb All are associated with organic matter : Cu > Ag, Pb All form stable complexes and sparingly soluble solid phases with S(-II) All coprecipitate with / sorb to Fe oxides : Pb > Ag, Cu

  5. Depth Distributions of Sedimentary ProcessesHingham Bay Site (not to scale)

  6. Data Treatment:Averaged and smoothed profiles

  7. Fe and S cycling Winter

  8. Fe and S cycling Summer

  9. Fe and S cycling Late Summer / Early Fall

  10. Trace Metal Cycling: Cu - Winter

  11. Trace Metal Cycling: Cu - Summer

  12. Trace Metal Cycling: Cu - Late summer

  13. Compare: Cu and Ag

  14. Compare: Cu and Pb

  15. The sedimentary environment

  16. Sediment Resuspension:Experimental Setup

  17. Sediment Resuspension:Mass resuspended vs. bottom stress

  18. Solid Phase Metals

  19. Dissolved metals

  20. Longer-term releasefrom resuspended particles Incubations: Filled : particle incubations Open: filtered controls

  21. Bottom stress at theHingham Bay Site

  22. Including Sediment-Seawater exchange in the budget for Cu in Boston Harbor

  23. Conclusions Remobilization of contaminant metals, deposited earlier, may be a significant source of metals to Boston Harbor. Ongoing work: Complete analyses and interpretation of Boston Harbor and Mass Bay experiments. To date: Kalnejais (2005) - PhD Thesis (and presentations at AGU, ASLO, GSA) Oates (2008) MS Thesis Morford et al. (2007) Kalnejais et al. (2007) Martin and Kalnejais (2007) Future work: Update and extend contaminant metal budgets for Boston Harbor Determine distributions of particulate metals in Mass. Bay - especially after important resuspension events

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