Study of the fragment composition of humic acids of different origin using IR-EXPERT software

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“…4) that were not detected in all 10 samples of our study and were not included in Table 2. *The massif Mongun-Taiga occupies the outside part of South-Western Tuva, which is orographic node at the junction of the mountain systems of the Altai, West Sayan, and West Tanu-Ola, **Alash plateau is a part of the South-Sayan mountain meadow-taiga-steppe locally basin-steppe region of the Southern Altai-Tuva-Khangai basin-mountain province of the steppe zone, ***Pass Bora-Tayga is located in the South-Eastern part of the Alash plateau The comparison of the received SRs with the results presented earlier in the study by Tikhova et al [9,10] show that compounds from DB -tetraenamide (No. reg =29041) and 1-acetamidopropan-2-yl acetate (No.…”

“…A comparison of full spectral curves (the Euclidean metric) gives better results than the method of descriptor describing. [9] As a result, search result (SR) consisting of 10 organic compounds available in the DB of the IR EXPERT was received for each of the 10 samples of HA. It was found that 3 compounds (No.…”

“…There is pyrimidine-pyrazinoic skeleton in two samples, which was previously discovered in HA of peat and tundra soils. [9] Thus, it is possible to solve a variety of spectral and structural tasks that would significantly complement the picture of the HA structure on the basis of the analysis of its infrared spectra with the use of modern information analytical system IR-EXPERT.…”

“…[6,7] However, they are merely illustrative, and in the most studies, the use of IR spectroscopy is limited by the traditional approach based on the use of correlation tables reflecting the relationship of the presence of characteristic groups and the absorption bands in certain parts of the spectrum. [7,8] The system IR-expert was used in the previous works for the analysis of complex mixtures of extractive substances of peat in Tomsk region, [9] HA of Siberian soils and peat, [9] as well as for the comparative analysis of HA of paleosoils of Khakassia. [10] ORIGINAL ARTICLE METHODS A total of 10 samples of HA [ Table 1] were extracted from the humic horizon of some modern soils of the Western Tuva according to standard methods.…”

Eco-Friendly Ferrimagnetic-Humic Acid Nanocomposites as Superior Magnetic Adsorbents

“…The functional groups on HA can form a relatively stable complex with heavy metal ions, and achieve the goal of removing heavy metals. Moreover, humic acid is environmentally friendly and does not cause secondary pollution during the removal process [ 12 , 13 ]. Therefore, HA is a promising material to modify ferrimagnetic nanoparticles.…”