Major ions in drinking and surface waters from five cities in arid and semi-arid areas, NW China: spatial occurrence, water chemistry, and potential anthropogenic inputs. - Li, Xiaoping; Zhang, Yu; Wu, Ting; Sun, Xuemeng; Yang, Tao; Wang, Lijun; Li, Xiaoyu; Wang, Jingzhi; Wang, Yanhua; Yu, Hongtao (Environmental Science & Pollution Research, 2020)