Ogundele, Damilola T, Department of Chemistry
Okash, Anfas N., Department of Ecology, College of Science, University of Basrah, Basrah, Iraq (Iraq)
Okeke, Peter Ndu, Department of Environmental Technology, Federal University of Technology, Owerri, Imo State, Nigeria (Nigeria)
Oktari, Amalia, Department of Chemistry, Universitas Syiah Kuala, Kopelma Darussalam, Banda Aceh – Indonesia (Indonesia)
Oktora, Ario, Universitas Muhammadiyah Palembang (Indonesia)