White jabon fruit (Anthocephalus cadamba Miq.) soaked in peat water which is rich in humic acid has the potential to be used as a biosorbent to adsorb lead(II) metal based on the cellulose content of jabon fruit and the active compounds contained in both. This research aims to determine the adsorption capacity and efficiency of white jabon fruit biosorbent in a batch system against lead(II) ion…