Analysis of Platinum (Pt) Ion Biosorption Performance Using Chitosan Fahny Ardian, Infantri Putra, Karla Jeclin Wonua, Sungging Pintowantoro, Yuli Setiyorini and Rizky Paramyta E3S Web Conf., 543 (2024) 03007 Published online: 03 July 2024 DOI: 10.1051/e3sconf/202454303007