4:00 PM - 4:15 PM
*Mumbfu Ernestine Mimba1,2, Takeshi Ohba1, Salomon César Nguemhe Fils2, Mengnjo Jude Wirmvem2, Nozomi Numanami1, Festus Tongwa Aka2 (1.Department of Chemistry, School of Science, Tokai University, Hiratsuka, Kanagawa 259-1292 Japan, 2.Institute of Geological and Mining Research (IRGM), P.O Box 4110 Yaounde, Cameroon)