Tsamo, Cornelius, Department of Chemistry, Faculty of Exact and Applied Sciences, University of N’Djamena, N'Djamena, Chad; & Department of Chemistry, Higher Teachers’ Training College, University of Maroua, P.O. Box 55 Maroua, Cameroon; & Department of Agricultural and E
Tsegai, Tesfai, Department of Agricultural Economics, Hamelmalo Agricultural College, P.O. Box 397, Keren
Tubreoumya, Guy Christian, Laboratoire de Physique et de Chimie de l’Environnement (LPCE), Université Joseph Ki Zerbo, Ouagadougou, Burkina Faso. Laboratoire de Mathématiques et Physique (LA.M.P.S), Université de Perpignan Via Domitia (UPVD), France.

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