IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 18 Analysis and Characterization Monday, 24 August 2026 / Hall B+C (direct infusion FTICR-MS [4]) or raw peak magnitudes (UHPLC-FTICR-MS [5]) versus time or space (e.g. lake depth). Depth profiles, for example in reservoirs or sediment pore-waters [4] or reaction time courses - for example photochemical transformations [4,5] – can be obtained for single MF. The KEY-components can be obtained by calculation of maximum relative abundance differences [4,5]. Overall, the presented approaches support a better understanding of NOM processing. Potential adsorption / desorption could be understood in sediment pore waters of an acidic mining lake [2]. The transformation of riverine NOM from terrestrial source to sea could be followed [6]. Highly reactive components could be identified by combining a photo degradation experiment with drinking water reservoir depth and seasonal dependent monitoring [4]. Photo degraded components, photo products, resistant components and intermediate products could be identified [5] after irradiation of an effluent organic matter sample and waste water treatment. References 1. Tang, G. et al., Environ. Pollut. 306 (2022) 119416. 2. Herzsprung et al., Org. Geochem. 108 (2017) 51. 3. Herzsprung et al., Environ. Sci. Technol. 46 (2012) 5511. 4. Herzsprung et al., Water Res. 232 (2023) 119672. 5. Herzsprung et al., Environ. Sci. Technol. 59 (2025) 13787. 6. Kamjunke et al., Water Res. 288 (2026) 124613. Acknowledgement The funding source identification and acknowledgement may be placed here.
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