“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) 14, no. 3 (September 30, 2026): 800–810. Accessed October 12, 2026. https://journal.umk.edu.my/index.php/jtrss/article/view/2534.