title: Sediment phosphorus extractants for phosphorus-31 nuclear magnetic resonance analysis: a quantitative evaluation.
abstract: 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.
authors.affiliation: Dep. of Physical and Analytical Chemistry, Analytical Chemistry, Uppsala Univ., Box 599, 751 24 Uppsala, Sweden.
authors.forename: Joakim
authors.initials: J
authors.lastname: Ahlgren
authors.forename: Heidi
authors.initials: H
authors.lastname: De Brabandere
authors.forename: Kasper
authors.initials: K
authors.lastname: Reitzel
authors.forename: Emil
authors.initials: E
authors.lastname: Rydin
authors.forename: Adolf
authors.initials: A
authors.lastname: Gogoll
authors.forename: Monica
authors.initials: M
authors.lastname: Waldebäck
mesh_terms: D004227:Dithionite / Q000737:chemistry; D004492:Edetic Acid / Q000737:chemistry; D019015:Geologic Sediments / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D010758:Phosphorus / Q000737:chemistry*; D010759:Phosphorus Isotopes; D012972:Sodium Hydroxide / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D010759:Phosphorus Isotopes; D014874:Water Pollutants, Chemical; D004227:Dithionite; D010758:Phosphorus; D012972:Sodium Hydroxide; D004492:Edetic Acid