Open AccessDetermination of Phosphorus Fertilizer Soil Reactions by Raman and Synchrotron Infrared Microspectroscopy
Author(s) -
Christian Vogel,
Christian Adam,
Ryo Sekine,
Tara L. Schiller,
Ewelina Lipiec,
Don McNaughton
Publication year - 2013
Publication title -
applied spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.415
H-Index - 110
eISSN - 1943-3530
pISSN - 0003-7028
DOI - 10.1366/13-07056
Subject(s) - pyrophosphate , chemistry , magnesium , phosphorus , phosphate , raman spectroscopy , calcium , magnesium phosphate , sewage sludge , phosphorite , apatite , inorganic chemistry , fertilizer , infrared , environmental chemistry , nuclear chemistry , mineralogy , sewage , organic chemistry , waste management , physics , optics , enzyme , engineering
The reaction mechanisms of phosphate-bearing mineral phases from sewage sludge ash-based fertilizers in soil were determined by Raman and synchrotron infrared microspectroscopy. Different reaction mechanisms in wet soil were found for calcium and magnesium (pyro-) phosphates. Calcium orthophosphates were converted over time to hydroxyapatite. Conversely, different magnesium phosphates were transformed to trimagnesium phosphate. Since the magnesium phosphates are unable to form an apatite structure, the plant-available phosphorus remains in the soil, leading to better growth results observed in agricultural pot experiments. The pyrophosphates also reacted very differently. Calcium pyrophosphate is unreactive in soil. In contrast, magnesium pyrophosphate quickly formed plant-available dimagnesium phosphate.
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