Sediment phosphorus extractants for phosphorus-31 nuclear magnetic resonance analysis: a quantitative evaluation

J Environ Qual. 2007 May 7;36(3):892-8. doi: 10.2134/jeq2006.0235. Print May-Jun 2007.


The influence of pre-extractant, extractant, and post-extractant on total extracted amounts of P and organic P compound groups measured with 31P nuclear magnetic resonance (31P-NMR) in lacustrine sediment was examined. The main extractants investigated were sodium hydroxide (NaOH) and sodium hydroxide ethylenediaminetetraacetic acid (NaOH-EDTA) with bicarbonate buffered dithionite (BD) or EDTA as pre-extractants. Post extractions were conducted using either NaOH or NaOH-EDTA, depending on the main extractant. Results showed that the most efficient combination of extractants for total P yield was NaOH with EDTA as pre-extractant, yielding almost 50% more than the second best procedure. The P compound groups varying the most between the different extraction procedures were polyphosphates and pyrophosphates. NaOH with BD as pre-extractant was the most efficient combination for these compound groups.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Dithionite / chemistry
  • Edetic Acid / chemistry
  • Geologic Sediments / chemistry*
  • Magnetic Resonance Spectroscopy / methods*
  • Phosphorus / chemistry*
  • Phosphorus Isotopes
  • Sodium Hydroxide / chemistry
  • Water Pollutants, Chemical / chemistry


  • Phosphorus Isotopes
  • Water Pollutants, Chemical
  • Dithionite
  • Phosphorus
  • Sodium Hydroxide
  • Edetic Acid