Spatial Distribution of

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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 Chemistry
Division, AOML, NOAA, Miami, FL 33149
 
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Florida Bay
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Bottom type
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Low phosphate concentration in Florida Bay
water Zhang Chi, 2002
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Sediment sampling station
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Sequential extraction procedure
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Percentage of CaCO3 in Florida Bay sediments
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Total Sedimentary Phosphorus in Florida Bay
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Total exchangeable phosphorus by MgCl2 extraction
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Exchangeable Inorganic phosphorus by MgCl2
extraction
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Exchangeable organic phosphorus by MgCl2
extraction
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Iron-bound Phosphorus by dithionite extraction
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Reactive iron in Florida Bay sediments
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Salinity of Florida Bay water during sediment
sampling By courtesy of Lee John
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CaCO3-bound total phosphorus by HAc (pH 4)
extraction
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CaCO3-bound inorganic phosphorus
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CaCO3-bound organic phosphorus
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Detrital phosphorus by HCl extraction
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Residual refractory organic phosphorus by ashing
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comparison
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Percentage of Different Forms of Sedimentary
Phosphorus
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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

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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 NOAAs South
Florida Ecosystem Restoration, Prediction and
Modeling Program