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Spatial Distribution of Different Forms of Sedimentary Phosphorus in Florida Bay: sequential extraction approach Jia-Zhong Zhang and Charles Fischer Ocean.

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Presentation on theme: "Spatial Distribution of Different Forms of Sedimentary Phosphorus in Florida Bay: sequential extraction approach Jia-Zhong Zhang and Charles Fischer Ocean."— Presentation transcript:

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 water Zhang & Chi, 2002

5 Sediment sampling station

6 Sequential extraction procedure

7 Percentage of CaCO 3 in Florida Bay sediments

8 Total Sedimentary Phosphorus in Florida Bay

9 Total exchangeable phosphorus by MgCl 2 extraction

10 Exchangeable Inorganic phosphorus by MgCl 2 extraction

11 Exchangeable organic phosphorus by MgCl 2 extraction

12 Iron-bound Phosphorus by dithionite extraction

13 Reactive iron in Florida Bay sediments

14 Salinity of Florida Bay water during sediment sampling By c ourtesy of Lee & John

15 CaCO 3 -bound total phosphorus by HAc (pH 4) extraction

16 CaCO 3 -bound inorganic phosphorus

17 CaCO 3 -bound organic phosphorus

18 Detrital phosphorus by HCl extraction

19 Residual refractory organic phosphorus by ashing

20 comparison

21

22 Percentage of Different Forms of Sedimentary Phosphorus

23 Summary Strong W-E spatial gradient in TSP and every forms of sedimentary P CaCO 3 -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

24 Sunset Acknowledgements: This research was supported by NOAA’s South Florida Ecosystem Restoration, Prediction and Modeling Program 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: /2004GB002255, Zhang, J.-Z., J. Chi (2002) Automated analysis of nanomolar concentrations of phosphate in natural waters with liquid waveguide, Environmental Science & Technology, 36(5):


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