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Published online 29 March 2006
Published in Soil Sci Soc Am J 70:856-862 (2006)
DOI: 10.2136/sssaj2005.0184
© 2006 Soil Science Society of America
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Right arrow Phosphorus
Right arrow Nuclear Magnetic Resonance, NMR

Hydrolysis of Pyrophosphate in a Highly Calcareous Soil

A Solid-State Phosphorus-31 NMR Study

T. M. McBeatha,*, R. J. Smernika, E. Lombib and M. J. McLaughlina,b

a Soil and Land Systems, School of Earth and Environmental Sciences, The Univ. of Adelaide, PMB 1, Waite Campus, Glen Osmond, SA 5064, Australia
b CSIRO Land and Water, PMB 2, Glen Osmond, SA 5064, Australia


Figure 1
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  		Fig. 1. Solid-state 31P direct polarization (DP) spectra of Na and Ca orthophosphate and pyrophosphate salts.

 

Figure 2
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  		Fig. 2. Solid-state 31P cross polarization (CP) and direct polarization (DP) spectra of unamended soil and soil amended with pyrophosphate supplying 2000 mg P kg soil–1 and incubated for 1 to 21 d. The vertical scales of the spectra have been set to allow direct comparison within the series of CP and DP spectra.

 

Figure 3
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  		Fig. 3. Orthophosphate-P and pyrophosphate-P concentration determined by solid-state NMR spectroscopy and ion chromatography on a sodium hydroxide P extract. The "undetected" P was calculated as total P minus the sum of orthophosphate-P and pyrophosphate-P.

 




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