Available online at www.sciencedirect.com ScienceDirect Procedia Earth and Planetary Science 17 (2017) 416 – 419 15th Water-Rock Interaction International Symposium, WRI-15 Hydrogeological and geochemical comparison of high arsenic groundwaters in inland basins, P.R China Huaming Guoa,b,1, Di Zhanga,b, Ping Nia,b, Yongsheng Caoa,b, Fulan Lib a State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, P.R China b School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, P.R China Abstract High As groundwater has been widely found in inland basins of P.R China, which has posed a serious heath effect on local residents Although these inland basins experience arid-semiarid climate, and are filled with Quaternary sediments, As concentrations show big variations Three inlands basins (the Hetao basin (HT), the Yinchuan basin (YC), and the Songnen basin (SN)) have been investigated to characterize chemistry and geochemistry of groundwaters and sediments and to evaluate their controls on As concentrations Arsenic concentrations ranged between