IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 114 NOM and Aquatic Systems Thursday, 27 August 2026 / Hall C than that of free chlorine with phenol (k = 18 M-1s-1 [3]), which is generally considered a stronger oxidant than organic chloramines. Chlorinated products (aromatic substitution on the phenol ring) were identified as stable products, simultaneously monitored during kinetic measurements using HRMS. The exceptionally high reactivity of N-chlorouridine toward phenolic moieties, along with the formation of chlorinated products with potential toxicological relevance, highlights the need for further investigation and consideration in water treatment practice. References 1. M. B. Heeb, I. Kristiana, D. Trogolo, J. S. Arey, U. von Gunten, Water Research 110 (2017) 91. 2. T. Zhang, U. von Gunten, Water Research 242 (2023) 120131. 3. M. Deborde, U. von Gunten, Water Research 42 (2008) 13. Acknowledgement This research was funded by the Swiss National Science Foundation (Project No. P5R5PN_230600). I gratefully acknowledge the full support of my host institution, the Uchem department at Eawag.
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