Alexander Chidiebere Okoro, Louis Chukwuemeka Orakwe, Chike Pius Nwachukwu, Ella Ifeanyi Ugwu, Elijah Chibuzo Ugwu, Kenneth Eze, and Chukwuemeka Obumneme Umobi. “Optimum Value for Zinc Removal from Saponin-Based Soil Washing Across Soils at Onyeama Dumpsite, Enugu State”. Greenation International Journal of Engineering Science 3, no. 2 (August 14, 2025): 74–85. Accessed December 28, 2025. https://research.e-greenation.org/GIJES/article/view/545.