BOOK OF ABSTRACTS 45 IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 Monday, 24 August 2026 / Hall B+C Analysis and Characterization DOC concentration from fluorescence data, Fluocopée® time series improved the estimation of annual DOC fluxes for the 2023–2024 hydrological year compared to traditional discrete sampling. During 2024, increased Seine flow rate was partly driven by intense rainfall events. These precipitation events led to the discharge of untreated wastewater into the river via combined sewer overflows (CSO). By comparing fluorescence time series from MeSeineMatOS probes located upstream and downstream of Paris conurbation, distinct fluorescence peaks were attributed to inputs of fresh and labile DOM. These peaks are specifically observed in / pairs associated with protein-like DOM and display rapid dynamics (on an hourly timescale). Continuous, high-frequency monitoring was therefore essential to detect them, highlighting the value of such approaches for real-time river water quality assessment. References 1. Bieroza M, Acharya S, Benisch J, ter Borg RN, Hallberg L, Negri C, et al. Advances in Catchment Science, Hydrochemistry, and Aquatic Ecology Enabled by High-Frequency Water Quality Measurements. Environ Sci Technol. 28 mars 2023;57(12):4701‑19. 2. Carstea EM, Popa CL, Baker A, Bridgeman J. In situ fluorescence measurements of dissolved organic matter: A review. Sci Total Environ. 10 janv 2020;699:134361. 3. Goffin A, Varrault G, Musabimana N, Raoult A, Yilmaz M, Guérin-Rechdaoui S, et al. Improving monitoring of dissolved organic matter from the wastewater treatment plant to the receiving environment: A new high-frequency in situ fluorescence sensor capable of analyzing 29 pairs of Ex/Em wavelengths. Spectrochim Acta A Mol Biomol Spectrosc. sept 2024;125153.
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