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.
Highlights
Humic acids (HAs) are polydisperse components of soils, peat, and brown coal which are unique as they are characterized by a number of specific features
In order to obtain more detailed description of HA chemical structure, it is proposed to use the methods of thermal modification, which makes it possible to reduce the effect of unstable peripheral structural groups on HA properties
The obtained data on elemental and functional composition of НА and НА250 are given in table 2
Summary
Humic acids (HAs) are polydisperse components of soils, peat, and brown coal which are unique as they are characterized by a number of specific features. They are commonly used in the agricultural, environmental, and industrial sectors. The latest studies have shown that HAs are heterpolycondensates carrying a great variety of functional groups which make macromolecules of HA different in composition, which, in its turn, contributes to the diversity of HA samples. This does not permit a holistic description of HA chemical structure.
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