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 ?m² 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.

Laser-induced breakdown spectroscopy and digital image data fusion for determination of the Al, Ca, Fe, Mg, and P in mineral fertilizer: overcome matrix effects in solid direct analysis

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Accurate and rapid detection of soil and fertilizer properties based on visible/near-infrared spectroscopy

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