16:00 〜 16:15
*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)