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Hydrolysis of Pyrophosphate in a Highly Calcareous Soil

A Solid-State Phosphorus-31 NMR Study

^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

View larger version (20K): [in a new window]   Fig. 1. Solid-state 31P direct polarization (DP) spectra of Na and Ca orthophosphate and pyrophosphate salts.

View larger version (17K): [in a new window]   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.

View larger version (22K): [in a new window]   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.