1. Institute of Petroleum Studies, University of Port Harcourt, PMB 2, Choba, Port Harcourt 500102, Rivers State, Nigeria
2. Department of Chemical Sciences, Oduduwa University, Ipetumodu, Ile-Ife 220371, State of Osun, Nigeria
3. Technical Department, Greenfield-Oaks Limited, London SE25 4HL, UK
4. Department of Pure and Industrial Chemistry, University of Port Harcourt, PMB 5323, Port Harcourt 500102, Rivers State, Nigeria