Please note: The abstracts included in this Book of Abstracts have not undergone language editing or proofreading. They are published as submitted by the authors, who bear full responsibility for their language and content. Book of Abstracts 23rd Meeting of the International Humic Substances Society and the 9th IWA Specialist Conference on Natural Organic Matter (NOM) 23–28 August 2026, Brno, Czechia Published by SOLEN, s. r. o., Olomouc 2026 SOLEN, s. r. o., Lazecká 297/51, 779 00 Olomouc In cooperation with Faculty of Chemistry, Brno University of Technology Brno 2026 Editor: Mgr. Hedvika Šlanhofová, slanhofova@solen.cz ISBN 978-80-7471-584-6
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