Humic composites - sorbents for analysis of river water qualityAlina Djekshenbekovna Kerimbaeva, Nurila Narynbekovna Mambetjanova, Anar Askarbekovna Zaripova and Sergei Pavlovich LiBIO Web Conf., 120 (2024) 01071DOI: https://doi.org/10.1051/bioconf/202412001071