Concd. solns. of NH4NO3 (50% by mass), buffered with (NH4)(2) HPO4 (15% by mass), were studied by differential scanning calorimetry and physicochem. anal. of the reaction products in the presence of (NH3OH)(2) SO4 (5% by mass) or glucose (3% by mass). The buffered soln. of NH4NO3 was stable up to 295 degrees C. The addn. of (NH3OH)(2)SO4 resulted in a significant decrease in its decompn. temp. (from 140 degrees C to 85 degrees C) without any decompn. of nitrate ions. The addn. of glucose resulted in oxidn. of the carbonyl and OH groups with formation of elemental C. Temp. of the reaction beginning was 165 degrees C. Chromatog. anal. and mass spectrometry did not show any presence of N2O in the gaseous reaction products.