Fluorine, which exists widely in nature, is known as the most active non-metallicelement. The main sources of environmental pollution of fluoride are from wastes, which areproduced in coal burning and other industrial process, such as steel, aluminum smelting,fertilizer, glass, fluorine industry and so on. The anomalies of fluoride are mainly in volcanicareas, fluoride deposit area and drought, semi-arid deserts and grassland. In addition, a largeamount of evaporation is another main source of fluoride, bec...