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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Abstract. The article analyzes the effect of thermal modification of different-type peat on the alteration of elemental and functional composition of peat humic acids. Based on the data of IR-spectra and readings of electron paramagnetic resonance, structural alterations are identified. It is shown that the impact of peat characteristics on humic acids is preserved after thermal modification. It is revealed that the strongest alteration of humic acid composition and properties caused by peat heating are typical to humic acid samples extracted from the peat with low decomposition degree.