[Abstract] There are few reports on the research on the rare earth element in natural water. The difficulties for the determination of REEs in natural water are due to the low concentration in natural water. However, remarkable development of commercial chelate resin column (HITACHI NOBIAS PA-1) enabled simultaneously concentrated separation of rare earth elements in natural water sample. In this study, the geochemical studies on the rare earth elements in the river around the Lake Biwa and Yodo River system by ICP-MS with the chelate resin column separation method
