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Soil Science Society of America Journal Abstract -

Solubility and Phosphorus-31 Magic Angle Spinning Nuclear Magnetic Resonance of Phosphorus in Sludge-Amended Soils


This article in SSSAJ

  1. Vol. 53 No. 4, p. 1057-1061
    Received: June 15, 1988

    * Corresponding author(s):
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  1. Zeina R. Hinedi  and
  2. Andrew C. Chang
  1. Soil Science Dep., 2169 McCarty Hall, Univ. of Florida, Gainesville, FL 32611
    Dep. of Soils and Environmental Sciences, Univ. of California, Riverside, CA 92521



The solubility of P in two sludge-amended soils was studied. Solubility and activity ratio diagrams for P in sludge-amended soils were constructed and were compared with those of selected Ca-P, Fe-P, and Al-P minerals. The solid phase controlling P solubility in the sludge-amended soils appeared to be a carbonated apatite formed through coprecipitation. The 31P magic angle spinning nuclear magnetic resonance (31P MAS NMR) examinations confirmed that P in the sludge-amended soils was in form of calcium phosphate. The resonant peak [at isotropic chemical shift (δlso) = 3.1 ppm] is indicative of an apatitic calcium phosphate environment characterized by carbonate substitution. Additionally, pyrophosphate was detected by the presence of a peak at δlso = −9 ppm.

Contribution from Dep. of Soil and Environmental Sciences, Univ. of California, Riverside.

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