Pollution sources of groundwater contamination diagnosed by boron isotope composition in Okinawa, Yoron, and Tarama Islands, southern Japan

Ke-HAN Song1, Yuto Ito1, Yumi Moromizato1, Ryuichi Shinjo1,2, Ryogo Takada3 and Jun Yasumoto4, (1)University of the Ryukyus, Faculty of Science, Okinawa, Japan, (2)RIHN Research Institute for Humanity and Nature, Research Department, Kyoto, Japan, (3)University of the Ryukyus, Center for Strategic Research Projects, Okinawa, Japan, (4)University of the Ryukyus, Faculty of Agriculture, Okinawa, Japan