Riyanto, Cucun Alep, Muhamad Syaiful Ampri, and Yohanes Martono. “Synthesis and Characterization of Nano Activated Carbon from Annatto Peels (Bixa Orellana L.) Viewed from Temperature Activation and Impregnation Ratio of H3PO4”. EKSAKTA: Journal of Sciences and Data Analysis 20, no. 1 (February 18, 2020): 44–50. Accessed November 21, 2024. https://journal.uii.ac.id/Eksakta/article/view/13566.