各国地面水中氟化物的含量大多在0.3(以mg/L计,下同)以下,除非特定污染,甚少超出0.7。海水平均含氟量为1.4。地下水流经含氟岩层时,引起氟化物的进入,其浓度于0.05～10以上。我国近年来全国范围的饮水调查表明,除上海市外,28个省、直辖市和自治区都存在一定范围的地下水高氟区,以北方为重。华南和西南各地地下水 Fluoride levels in surface waters of countries are mostly below 0.3 (in mg / L, same below) unless very little exceeds 0.7. The average sea level of fluorine is 1.4. Groundwater flows through the fluorite formation, causing fluoride to enter, the concentration of 0.05 to 10 or more. A nationwide survey on drinking water in recent years in our country shows that in addition to Shanghai, a certain range of high fluoride areas for groundwater exist in 28 provinces, municipalities directly under the Central Government and autonomous regions, with a heavy emphasis on the north. South China and Southwest all over the groundwater