1. Laboratory of Noxious Chemistry and Environmental Engineering, Department of Chemistry, Faculty of Science, University of Dschang, Dschang, Cameroon
2. Laboratory of water and environment Chemistry / Environmental Analysis and Processes EA2239, National Higher School of Chemistry, Rennes, France
3. Departement of Inorganic Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon