Spectroscopy of condensed matter

Optical characteristics of water extracts from the kuznetsk basin coals of various metamorphic states

N. L. Aluker^a, N. V. Nel’ubina^a, E. G. Gazenaur^b, A. V. Tupitsyn<sup>b

a</sup> The Federal Research Center of Coal and Coal-Chemistry of Siberian Branch of the Russian Academy of Sciences
^b Kemerovo State University, Kemerovo, Russia

Abstract: A study of the optical characteristics of aqueous extracts of coals of various metamorphic states was carried out. Both the absorption and luminescence spectra show a decrease in the intensity of the recorded signals with increasing coal metamorphism. We identify UV absorption with a maximum of 202 nm as the absorption of nitrate ion and luminescence with a maximum of 440 nm with the presence of humic compounds. The clear difference in intensities opens up the possibility of quantitative estimates of soluble nitrogen (by absorption) and of humic compounds (by luminescence) in coals when analyzing aqueous extracts of coals of various metamorphic states.

Keywords: coal, metamorphism, absorption spectrum, luminescence spectrum, nitrates, humic compounds.

Received: 15.03.2024
Revised: 30.05.2024
Accepted: 07.06.2024

DOI: 10.61011/OS.2024.06.58637.6153-24

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