PROCESS FOR REMOVAL OF CHROMIUM ION FROM LEATHER INDUSTRIAL WASTES BY ACTIVATED PURE RICE HUSK. FUDMA JOURNAL OF SCIENCES, [S. l.], v. 4, n. 4, p. 334–338, 2021. DOI: 10.33003/fjs-2020-0404-490. Disponível em: http://www.fjsadmin.fudutsinma.edu.ng/index.php/fjs/article/view/490. Acesso em: 11 sep. 2025.