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TECHNICAL REPORTS

Wetlands and Aquatic Processes

Sediment Phosphorus Extractants for Phosphorus-31 Nuclear Magnetic Resonance Analysis

A Quantitative Evaluation

^a Dep. of Physical and Analytical Chemistry, Analytical Chemistry, Uppsala Univ., Box 599, 751 24 Uppsala, Sweden
^b Inst. of Biology, Univ. of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
^c Dep. of Biochemistry and Organic Chemistry, Organic Chemistry, Uppsala Univ., Box 599, 751 24 Uppsala, Sweden
^d Dep. of Ecology and Evolution, Limnology, Uppsala Univ., Box 573, 751 23 Uppsala, Sweden

^* Corresponding author (Monica.Waldeback{at}kemi.uu.se)

Received for publication June 20, 2006. 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.

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