1. Unit for Environmental Sciences and Management, North West-University, Potchefstroom, South Africa
2. Africa Centre of Excellence in Oilfield Chemicals Research, University of Port Harcourt, Port Harcourt, Nigeria
3. Department of Microbiology, University of Port Harcourt, Port Harcourt, Nigeria
4. Department of Environmental Sciences, Florida Science Campus, University of South Africa (UNISA), South Africa
5. Soil Science programme, Agricultural Research Council – Natural Resources & Engineering (ARC – NRE), Pretoria, South Africa