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Solubility and Phosphorus‐31 Magic Angle Spinning Nuclear Magnetic Resonance of Phosphorus in Sludge‐Amended Soils
Author(s) -
Hinedi Zeina R.,
Chang Andrew C.
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/sssaj1989.03615995005300040012x
Subject(s) - magic angle spinning , soil water , solubility , chemistry , phosphate , coprecipitation , phosphorus , pyrophosphate , phosphorus 31 nmr spectroscopy , apatite , mineralogy , nuclear chemistry , environmental chemistry , inorganic chemistry , nuclear magnetic resonance spectroscopy , geology , soil science , stereochemistry , organic chemistry , enzyme
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 31 P magic angle spinning nuclear magnetic resonance ( 31 P MAS NMR) examinations confirmed that P in the sludge‐amended soils was in form of calcium phosphate. The resonant peak [at isotropic chemical shift (δ 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 δ lso = −9 ppm.