Puspitasari, F. et al. 2025. Analysis of the Desorption Capacity of Pb2+ and Cu2+ Metals on Silica and Silica-Chitosan Adsorbents. Hydrogen: Jurnal Kependidikan Kimia. 13, 4 (Sep. 2025). DOI:https://doi.org/10.33394/hjkk.v13i4.16781.