Quantification of Ammonium Sulphate Nitrate (ASN) fertilizers

This paper shows a simple procedure for the quantification of industrial and labo-ratory samples of Ammonium Sulphate-Nitrate fertilizers (ASN) based on a Rietveld fit from X-ray powder diffraction profiles. The Rietveld fit is performed by means of the structural models of the double salts 2NH4NO3·(NH4)2SO4 and 3NH4NO3·(NH4)2SO4, previously re-ported by the authors. The proposed method demonstrated to be highly accurate even when medium-low quality X-ray Powder Diffraction profiles are used. The result of the composi-tion of H, N and S in the samples is very similar to those obtained by elemental analysis.