“BIOSORPTION OF Ni (II) IONS BY ARABICAN COFFEE FRUIT (Coffea Arabica)”. Jurnal Akta Kimia Indonesia (Indonesia Chimica Acta) 11, no. 1 (May 30, 2019): 32–45. Accessed August 18, 2026. https://journal.unhas.ac.id/index.php/ica/article/view/6402.