1. Laboratory of Solid Minerals and Analytical Chemistry, Department of Chemistry, Faculty of Sciences, Oujda, Morocco
2. Hydrosciences, UMR 5569 (IRD, CNRS, UM), Montpellier, France
3. Applied Physical and Analytical Laboratory, Department of Inorganic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon