IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 252 Poster Session / Environment, Agriculture, and Forestry Hall A chemical diversity of organic matter [2]. Expected results include the first molecular „fingerprint“ of SOM in these deep deposits, identifying distinct elemental ratios and functional group distributions through van Krevelen diagrams (Fig 2). These high-resolution mass data will serve as a starting point for understanding interactions with pollutants, as specific oxygencontaining groups or aromatic structures indicate the SOM’s potential for metal sequestration. Such molecular insights are instrumental in evaluating how organic phases govern the facilitated transport of contaminants [3], including radionuclides [4]. References 1. T. Sasaki, T. Koukami, T. Kobayashi, et al., Journal of Nuclear Science and Technology, 54(3), 373381 (2017). 2. Y. Wang, Y. Liu, R. K. Chu, et al., ACS Earth and Space Chemistry, 6, 2142-2148 (2022). 3. D. Grolimund and M. Borkovec, Environmental Science & Technology, 39, 6378-6386 (2005). 4. P. Liu, X. Zhang, M. R. Soltanian, et al., Journal of Cleaner Production, 520, 145711 (2025). Fig 1: Experimental setup for Soxhlet extraction of SOM. Fig 2: van Krevelen diagram of preliminary experiment
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