Humic composites - sorbents for analysis of river water quality Alina Djekshenbekovna Kerimbaeva, Nurila Narynbekovna Mambetjanova, Anar Askarbekovna Zaripova and Sergei Pavlovich Li BIO Web Conf., 120 (2024) 01071 Published online: 15 July 2024 DOI: 10.1051/bioconf/202412001071