[A-HW27] Water Environment and Geology in Urban Areas

[AHW27-P01] Detection of PPCPs in shallow groundwater in the highly-urbanized Shinagawa area, central Tokyo, Japan.

★Invited Papers

*Yuki Itoh¹, Masaya Yasuhara², Seongwon Lee³, Takeshi Hayashi⁴, Chie Konishi⁵ (1.Rissho University graduate School of Geo-environmental Science, 2.Rissho Univ., 3.Department of Environmental Systems, Faculty of Geo-Environmental Science, RISSHO University, 4.Faculty of Education and Human Studies, Akita University, 5.Murata Keisokuki Service Co., Ltd.)

Keywords:central Tokyo, urban area, shallow groundwater, sewage leakage, PPCPs

With multi-tracer technique, we are studying the occurrence and degree of sewage leakage in shallow groundwater environment of the highly-urbanized, densely-populated Shinagawa area, central Tokyo. In this paper, the results for PPCPs will be discussed. Shallow groundwater samples collected in August 2021 from three wells in Kita-Shinagawa and one well in Minami-Shinagawa, all wells of less than 10 m deep, were analyzed for PPCPs. Elevated concentrations of six compounds of PPCPs (Bezafibrate, Caffeine, Carbamazepine, Crotamiton, N,N-diethyl-m-tolamide, Sulpiride) were detected in one well in Kita-Shinagawa, especially high in Bezafibrate with a concentration of 4,400 ng/L. For the other two wells in Kita-Shinagawa, one was characterized by four compounds such as Bezafibrate, Carbamazepine, Crotamiton, N,N-diethyl-m-tolamide and one by N,N-diethyl-m-tolamide. Carbamazepine and N,N-diethyl-m-tolamide were detected also in groundwater in Minami-Shinagawa. Our results that these artificial compounds, which are not supposed to exist in nature, were detected in groundwater clearly indicate the widespread occurrence of sewage leakage and its mixing with shallow groundwater in Shinagawa area, central Tokyo.