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Spatial Distribution of Different Forms of Sedimentary Phosphorus in Florida Bay:

Spatial Distribution of Different Forms of Sedimentary Phosphorus in Florida Bay: sequential extraction approach Jia-Zhong Zhang and Charles Fischer Ocean Chemistry Division, AOML, NOAA, Miami, FL 33149. Florida Bay. Bottom type.

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Spatial Distribution of Different Forms of Sedimentary Phosphorus in Florida Bay:

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  1. Spatial Distribution of • Different Forms of • Sedimentary Phosphorus • in Florida Bay: • sequential extraction approach • Jia-Zhong Zhang and Charles Fischer • Ocean Chemistry Division, AOML, NOAA, Miami, FL 33149

  2. Florida Bay

  3. Bottom type

  4. Low phosphate concentration in Florida Bay waterZhang & Chi, 2002

  5. Sediment sampling station

  6. Sequential extraction procedure

  7. Percentage of CaCO3 in Florida Bay sediments

  8. Total Sedimentary Phosphorus in Florida Bay

  9. Total exchangeable phosphorus by MgCl2 extraction

  10. Exchangeable Inorganic phosphorus by MgCl2 extraction

  11. Exchangeable organic phosphorus by MgCl2 extraction

  12. Iron-bound Phosphorus by dithionite extraction

  13. Reactive iron in Florida Bay sediments

  14. Salinity of Florida Bay water during sediment samplingBy courtesy of Lee & John

  15. CaCO3-bound total phosphorus by HAc (pH 4) extraction

  16. CaCO3-bound inorganic phosphorus

  17. CaCO3-bound organic phosphorus

  18. Detrital phosphorus by HCl extraction

  19. Residual refractory organic phosphorus by ashing

  20. comparison

  21. Percentage of Different Forms of Sedimentary Phosphorus

  22. Summary • Strong W-E spatial gradient in TSP and every forms of sedimentary P • CaCO3-bound P accounts 44% of TSP • Refractory organic P constitutes 24% of TSP • Iron-bound P accounts 19% of TSP • Exchangeable P accounts 8% of TSP

  23. Sunset Recent Publications: Zhang, Jia-Zhong, Charles J. Fischer, and Peter B. Ortner, (2004) Potential availability of sedimentary phosphorus to sediment resuspension in Florida Bay, Global Biogeochemical Cycles.18, GB4008, doi: 10.1029/2004GB002255, 2004. Zhang, J.-Z., J. Chi (2002) Automated analysis of nanomolar concentrations of phosphate in natural waters with liquid waveguide, Environmental Science & Technology, 36(5): 1048-1053. Acknowledgements: This research was supported by NOAA’s South Florida Ecosystem Restoration, Prediction and Modeling Program

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