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Determination of Phosphate Phases in Sewage Sludge Ash-Based Fertilizers by Raman Microspectroscopy
Volume 67, Number 9 (Sept. 2013) Page 1101-1105
CHRISTIAN VOGEL,* CHRISTIAN ADAM, and DON MCNAUGHTON
The chemical form of phosphate phases in sewage sludge ash (SSA)-based fertilizers was determined by Raman microspectroscopy. Raman mapping with a lateral resolution of 5 × 5 μm2 easily detected different compounds present in the fertilizers with the help of recorded reference spectra of pure substances. Quartz and aluminosilicates showed Raman bands in the range of 450–520 cm−1. Phosphates with apatite structure and magnesium triphosphate were determined at around 960 and 980 cm−1, respectively. Furthermore, calcium/magnesium pyrophosphates were detected in some samples.
Index Headings: Fertilizer; Sewage sludge ash; Phosphate; Raman microspectroscopy. .