“The Kinetics and Effect of PH on Removal of Manganese, Cadmium and Lead from Aqueous Solution by Maize Cobs”. Global Journal of Science Frontier Research 12, no. B6 (November 8, 2012): 29–38. Accessed August 13, 2026. https://www.journalofscience.org/index.php/GJSFR/article/view/440.