18:15 〜 18:30 ▲ [19p-E215-17] Measurement of ion concentration in the solution without reference electrodes using a terahertz chemical microscopy 〇Atsuya Mahana1、Yuki Maeno1、Kenji Sakai1、Toshihiko Kiwa1、Keiji Tsukada1 (1.Okayama Univ.)