Study of Spectral, Structural and Chemical characteristics of Humic Acids Isolated from Coalfield of Iran

Document Type : Research Paper


1 Associate Professor/ Department of Food Technology Engineering, College of Abouraihan, University of Tehran

2 M.Sc. graduated of Mechanical Engineering of Biosystems, Department of Agro-technology Engineering, College of Abouraihan, University of Tehran

3 Professor, Department of Agro-technology Engineering, College of Abouraihan, University of Tehran


Due to the significant impact of humic substances on a variety of environmental processes, knowing the chemical, spectroscopic and structural features of these substances should always be considered in studies related to the management and remediation of the impacted ecosystems. In this study, after the extraction and purification of Humic Acid (HA) from low grade coals of mines of IRAN, the gravimetric technic was used in order to determine the degree of purity of HA from non-destructive spectroscopies such as ICP-OES, UV-VIS, FT-IR and CHNOS for measuring the quality and quantity of HA. Also, microstructures of SEM were used in order to study the structure of HA; then the obtained results were compared with standard Aldrich HA. The results of the gravimetric analysis showed that the produced HA had a 98% degree of purification. Also, from the view of quantity, the results of elemental analysis of ICP-OES indicated that after the purification of HA, the concentration of various heavy metals in HA are lower than the recommended safety limit and there is a range of both macronutrients and micronutrients in the structure of HA. Moreover, the quality results of FT-IR, UV-VIS and SEM analysis have shown the presence of an aromatic predominant structure, rich in carboxylic and phenolic functional groups with high humification and condensation degrees, and type A with a loose spongy and heterogeneous porous surfaces for HA. The CHNOS analysis also confirmed the suitability of the coal used to extract HA, and showed that the final product matches the standard HA results.


Main Subjects

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