Utilization of Riau Peat-Derived Humic Acid Modified with Urea-Formaldehyde for Ni(II) Adsorption: A Geochemical Approach. Journal of Tropical Resources and Sustainable Science (JTRSS), [S. l.], v. 14, n. 3, p. 800–810, 2026. DOI: 10.47253/jtrss.v14i3.2534. Disponível em: https://journal.umk.edu.my/index.php/jtrss/article/view/2534. Acesso em: 12 oct. 2026.