Mineralization of Phosphorus in Sludge-Amended Soils Monitored by Phosphorus-31-Nuclear Magnetic Resonance Spectroscopy
- Zeina R. Hinedi ,
- A. C. Chang and
- R. W. K. Lee
The purpose of the experiment was to observe the changes occurring in the different phosphorus (P) pools in sludge-amended soils during incubation using 31P nuclear magnetic resonance spectroscopy (31P NMR) to qualitatively and quantitatively register P transformations. An acid and an alkaline soil were each incubated with sludges that underwent different digestion processes. The 31P NMR spectra of those soils after 1, 28, 70, and 140 d of incubation showed that P diesters completely hydrolyzed after 28 d of incubation in both soils, irrespective of the type of sludge incorporated. After 140 d of incubation, P monoesters were still detected in the acid soil while they had completely hydrolyzed in the alkaline soil. Pyrophosphates were detected after 70 d of incubation in the alkaline soil and 140 d of incubation in the acid soil. The study suggested that acidity has an adverse effect on the microbial degradation of P monoesters and pyrophosphates in sludge-amended soils.
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