In the present study, the humic acid isolated from coals of two coalfields of Nagaland, India has been characterized by Ultraviolet-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD), thermal analysis (TGA-DTA), and scanning electron microscopy (SEM) in relation to their origin. The humic acid reveals a high degree of humification with predominantly aromatic content, which is considered to be type-A humic acid.
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Das et al. (2015) studied this question.
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