IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 28 Analysis and Characterization Monday, 24 August 2026 / Hall B+C in the natural environment and water treatment systems. References I. Leenheer, J. A., Wilson, M. A. & Malcolm, R. L. Presence and potential significance of aromaticketone groups in aquatic humic substances. Organic geochemistty 11, 273–280 (1987). 2. Cory, R. M. & McKnight, D. M. Fluorescence Spectroscopy Reveals Ubiquitous Presence of Oxidized and Reduced Quinones in Dissolved Organic Matter. Environmental science & technology 39, 8142–8149 3. Maurer, F., Christl, l. & Kretzschmar, R. Reduction and Reoxidation of Humic Acid: Influence on Spectroscopic Properties and Proton Binding. Environ Sci Technol 44, 5787–5792 (2010). 4. Macalady, D. L. & Walton-Day, K. New light on a dark subject: On the use of fluorescence data to deduce redox states of natural organic matter (NOM). Aquatic sciences 71, 135–143 (2009). Acknowledgement We gratefully acknowledge funding support from the US National Science Foundation (CHE #2237194).
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