Biosorption of Heavy Metals (Chromium and Copper) using Bacillus Firmus isolated from contaminated gold mining soil of Anka in Zamfara State, Nigeria. CaJoST [Internet]. 2019 Feb. 26 [cited 2024 Dec. 22];1(1):6-11. Available from: https://cajost.com.ng/index.php/files/article/view/25