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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)
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