Author contribution: Ubushaev SV — development of research design, conducting experiments to assess the effects of filtration and composition of the medium, collection and interpretation of spectral data, writing the main text of the manuscript; Sepp VV — scientific guidance of the work, formulation of a working hypothesis, critical analysis of the obtained patterns, editing and approval of the final version of the article; Bakulin KS — participation in the validation of the analytical method, processing of the obtained results, work with equipment and materials, technical verification of data; Sen OYu — concept development, provision of resources, manuscript writing.