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

Soil Science Dep., 2169 McCarty Hall, Univ. of Florida, Gainesville, FL 32611

Andrew C. Chang

Dep. of Soils and Environmental Sciences, Univ. of California, Riverside, CA 92521

*Corresponding author.

ABSTRACT

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 (_lso) = 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 _lso = –9 ppm.

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

Received for publication June 15, 1988.

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