ABDULKADIR, Y.; HALID, A.; ABDULAZEEZ, A. Y.; GULUMBE, N. S.; RUKAIYAT, M.; YAKUBU, C. I.; ANTEYI, A. PROCESS FOR REMOVAL OF CHROMIUM ION FROM LEATHER INDUSTRIAL WASTES BY ACTIVATED PURE RICE HUSK. FUDMA JOURNAL OF SCIENCES, v. 4, n. 4, p. 334 - 338, 14 Jun. 2021.