K. S. Votolin, S. I. Zherebtsov, K. M. Shpakodraev
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Relationship of Structural-Group Composition and Biological Activity of Humic Substances from Unoxidized and Oxidized Coals at Different Stages of Coalficiation
The article presents the results of a study of unoxidized and naturally oxidized (weathered) brown and hard coals of early diagenesis and humic acids (HAs) and fulvic acids (FAs) obtained from them. Using 13C NMR (CP/MAS) spectroscopy, it was found that the structural-group composition of the isolated HAs was determined by the composition of the original coals (R2 = 0.81), and it affected the magnitude of biological activity using wheat seeds as an example (R2 = 0.75). The structural-group composition of the isolated FAs was weakly related to the composition of the original coals, and it was more homogeneous. The high quantitative yield and biological activity of HAs and FAs from unoxidized and oxidized brown coals allowed us to recommend them for agriculture. The HAs and FAs from oxidized coals had low biological activity, and they can be considered as technical reagents.
期刊介绍：
The journal publishes theoretical and applied articles on the chemistry and physics of solid fuels and carbonaceous materials. It addresses the composition, structure, and properties of solid fuels. The aim of the published articles is to demonstrate how novel discoveries, developments, and theories may be used in improved analysis and design of new types of fuels, chemicals, and by-products. The journal is particularly concerned with technological aspects of various chemical conversion processes and includes papers related to geochemistry, petrology and systematization of fossil fuels, their beneficiation and preparation for processing, the processes themselves, and the ultimate recovery of the liquid or gaseous end products.
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