Bapa Y, Botahala L. Effect Of The Contact Time Of Candlenut Shell Charcoal And H3PO4 Activator As On The Purification Process Of Used Cooking Oil. ICA [Internet]. 2019Dec.10 [cited 2024Dec.4];12(2):104-10. Available from: https://journal-old.unhas.ac.id/index.php/ica/article/view/7889