Abstract
By means of sequential extractions with Ca-NTA and EDTA, a separation was performed between Fe(OOH) ≈ P and CaC03≈P in a few sediments; the remaining fraction, considered to be organic phosphate, was quantified as well. We found that with the commonly used method of extraction with NaOH and H2S04, less Fe(OOH) ≈ P and much more CaC03 ≈ P was found than with the chelating extractants. The organic phosphate pool in live and dead algal material and in some mud samples was partly hydrolysed and therefore recovered as inorganic phosphates with classical extractions. The difference between chelating extractants and the classical ones is discussed.
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Abbreviations
- o-P::
-
ortho phosphate (or its concentration)
- org-P::
-
organic phosphate
- extr-P::
-
extractable sediment bound phosphate
- extr-Fe::
-
extractable sediment bound iron
- Fe(OOH) ≈ P::
-
iron bound, sediment phosphate
- CaCO3 ≈ P::
-
calcium bound, sediment phosphate
- org-C::
-
organic sediment bound carbon
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de Groot, C.J., Golterman, H.L. Sequential fractionation of sediment phosphate. Hydrobiologia 192, 143–148 (1990). https://doi.org/10.1007/BF00006010
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DOI: https://doi.org/10.1007/BF00006010