Botanical composition of terrestrial peat and fen peat with decomposition degree (R) ranging from 25% to 45% has been studied and technical analysis has been carried out. The effect of heat treatment on peat group composition alteration was evaluated. The peculiarities defined by the preliminary heat treatment were revealed. Optical properties of peat were studied by IR spectroscopy. Conclusions about the degree of heat treatment influence on the physicochemical properties of peat were made

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The article examines the impact of thermal peat modification on the elemental content and properties of humic acids. It has been revealed that preliminary heat treatment of different peat types characterized by various decomposition degrees causes the changes in elemental content; precisely it leads to the increase in macromolecule benzoid degree and subsequent enhancement of its thermal stability