1. University Joseph Ki Zerbo (UJKZ),Unit of Life and Earth Sciences Research and Training,Department of Earth Sciences,Ouagadougou,Burkina Faso
2. National University of Science and Technology Politehnica Bucharest (UNSTPB),Faculty of Energy Engineering,Department of Hydraulic Machineries and Environmental Engineering,Bucharest,Romania
3. National University of Science and Technology Politehnica Bucharest (UNSTPB),Faculty of Chemical Engineering and Biotechnologies,Department of Analytical Chemistry and Environmental Engineering,Bucharest,Romania
4. University of Yaoundé I (UYI),Faculty of sciences,Department of Inorganic Chemistry,Yaoundé,Cameroon