Abstract
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 ?m<sup>2</sup> 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<sup>?1</sup>. Phosphates with apatite structure and magnesium triphosphate were determined at around 960 and 980 cm<sup>?1</sup>, respectively. Furthermore, calcium/magnesium pyrophosphates were detected in some samples.
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