Zilfa, Z., Safni and Amanda, S. 2024. The Potential of Palm Shell Activated Carbon as an Adsorbent for Heavy Metals in The Recycling Process of Used Lubricating Oil. INDONESIAN JOURNAL OF CHEMICAL RESEARCH. 9, 1 (Jul. 2024). DOI:https://doi.org/10.20885/ijcr.vol9.iss1.art3.