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Phosphorus‐31 Magic Angle Spinning Nuclear Magnetic Resonance of Wastewater Sludges and Sludge‐Amended Soil
Author(s) -
Hinedi Zeina R.,
Chang Andrew C.,
Yesinowski James P.
Publication year - 1989
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1989.03615995005300040011x
Subject(s) - magic angle spinning , chemistry , sewage sludge , phosphate , phosphorus , nuclear chemistry , environmental chemistry , pyrophosphate , mineralogy , nuclear magnetic resonance spectroscopy , sewage treatment , environmental science , environmental engineering , organic chemistry , biochemistry , enzyme
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, 31 P MAS NMR indicated the presence of carbonated apatite and pyrophosphate solid phases.