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Phosphorus-31 Magic Angle Spinning Nuclear Magnetic Resonance of Wastewater Sludges and Sludge-Amended Soil

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

James P. Yesinowski

formally, Div. of Chemistry and Chemical Engineering, California Inst. of Technology, Pasadena, CA 91125

*Corresponding author.

ABSTRACT

Phosphorus-31 magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy was used to examine the forms of P in two municipal sludges and a sludge-amended soil. The signal-to-noise ratio and the resolution of the spectra improved considerably when paramagnetics in the sludge and sludge-treated soil samples were removed by a reducing treatment involving citrate-bicarbonate-dithionite (CBD). The spectra suggested that the P solid phases in the anaerobically digested sludge from Los Angeles County, California were calcium phosphates. The strong paramagnetic effects, however, precluded more precise identification of the calcium phosphate phase. In the anaerobically digested alum-treated sludge from Riverside, three P solid phases are detected, carbonated apatite, a pyrophosphate, and aluminium phosphate. In the Domino soil (fine-loamy, mixed, thermic Xerollic Calciorthid), amended with sludge from Los Angeles County, ³¹P MAS NMR indicated the presence of carbonated apatite and pyrophosphate solid phases.

current address: Dep. of Chemistry, Michigan State Univ., East Lansing, MI 48824-1322. Contribution from the Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, and the Division of Chemistry and Chemical Engineering, California Inst. of Technology.

Received for publication June 15, 1988.

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