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氟是地壳中存在很广泛的一种元素,平均含量为770ppm,但其分布很不平均。1970年世界卫生组织统计在各国天然水中含氟量为0.4～95.0ppm。在干旱的内陆盆地及盐渍过的海滨地区其土壤、水源、农作物中含氟量都高。在我国的北方、西北、西南地区饮水含氟量就很高。在我国饮用水的23项标准中明确规定饮水含氟量正常为0.5～1.0毫克/升。
Fluorine is a very widespread element in the crust, with an average content of 770 ppm, but its distribution is very uneven. 1970 World Health Organization statistics in various countries natural water fluorine content of 0.4 ~ 95.0ppm. In arid inland basins and salted seaside areas, soil, water and crops contain high levels of fluoride. In our country’s north, northwest, southwest drinking water fluoride content is very high. 23 standards in China’s drinking water clearly stipulates that the amount of fluoride in drinking water is normal 0.5 to 1.0 mg / l.