Xi’an Center;
China Geological Survey;
Ministry of Natural Resources;
Xi’an 710054;
China;
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region;
Ministry of Education;
Xi’an 710054;
China;
Key Laboratory for Geo-hazards in Loess Area;
Ministry of Natural Resources;
Xi’an 710054;
China;
Field Base of Scientific Observation of Shaanxi Tongguan;
Ministry of Natural Resources;
Xi’an 710054;
China;
Dalian ocean and fishery comprehensive administration supervision lochus;
Dalian 116000;
China;
Assiut Branch;
Al-Azhar University;
Assiut 71524;
Egypt;
Fluoride; Groundwater; Human health risks; Loess Plateau; Hydrogeological survey engineering; Dali County; Shaanxi Province; China;