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Influence of pH and redox on mobilization of inositol hexakisphosphate from oligotrophic lake sediment

  • Kasper Reitzel
  • Henning S. Jensen
  • Benjamin L. Turner
  • Charlotte Jørgensen
Article
  • 36 Downloads

Abstract

It has been suggested that inositol hexakisphosphate (IP6) contributes to the release of phosphorus (P) from lake sediments, but a mechanistic understanding remains elusive. We investigated the potential mobilization and mineralization of myo- and scyllo-IP6 from the sediment of an oligotrophic Danish lake known to contain high concentrations of inositol phosphates. Solution 31P NMR spectroscopy was used to determine changes in myo- and scyllo-IP6 in laboratory microcosms incubated under either oxic or anoxic conditions. In addition, we incubated sediment slurries adjusted to pH between 4.9 and 6.6, with and without addition of myo-IP6, and induced redox changes by adding starch and sulfate. We observed no significant changes in myo- or scyllo-IP6 after 1 year of incubation under anaerobic conditions. A sequential extraction procedure revealed that one half of the added myo-IP6 was recovered in the humic acid fraction (acid-insoluble organic matter) and the other half in the fulvic acid fraction (acid-soluble organic matter). Reduction in redox potential by starch addition did not mobilize myo-IP6, but myo-IP6 bound to humic acids was released to the pore water when the pH was increased to ≥ 5.8. This pH-induced mobilization of IP6 occurred in parallel with increases in dissolved iron and organic matter, suggesting the release of IP6 bound to humic acids through metal bridges. We conclude that myo-IP6 mobilization from this oligotrophic lake sediment is driven by changes in pH rather than by changes in the redox potential.

Keywords

myo-inositol hexakisphosphate scyllo-inositol hexakisphosphate d-chiro-inositol hexakisphosphate neo-inositol hexakisphosphate Solution 31P NMR spectroscopy Sequential phosphorus extraction 

Notes

Acknowledgements

We thank the Villum Kann Rasmussen Foundation for financial support to the Centre of Excellence CLEAR (Centre for Lake Restoration).

Supplementary material

10533_2018_468_MOESM1_ESM.docx (52 kb)
Supplementary material 1 (DOCX 51 kb)

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  • Kasper Reitzel
    • 1
  • Henning S. Jensen
    • 1
  • Benjamin L. Turner
    • 2
  • Charlotte Jørgensen
    • 1
  1. 1.Institute of Biology, University of Southern DenmarkOdense MDenmark
  2. 2.Smithsonian Tropical Research InstituteBalboa, AnconPanama

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