Fluorine Detection in Drinking Water Using HR-CS AAS

摘要

Due to its high electro negativity the element fluorine is the most reactive non-metal and thus does not occur in elementary, but only in combined form. Fluorine is the most widespread halogen. Its share in the earth's crust is approx. 0.08%. It occurs in large quantities in apatite Ca2(PO4)3(OH,F) and in fluorite CaF2 as well as in the almost exhausted cryolite Na3AIF6 [1]. It is therefore no surprise that fluoride is also found in almost all water bodies - although the fluoride concentration can differ greatly by water type and the geogenic conditions. Seawater contains more than 1mg/L fluoride, rivers and lakes approx. 0.05 -0.5mg/L, whereas in ground water values above 0.5mg/L are relatively rare. However, in deepwater, especially in sources from hydrothermal deposits, significantly higher fluoride content can also be found, e.g. in geysers more than 20mg/L. Mainly responsible for the fluoride content are the pH value, temperature, solubility conditions and geological preconditions [2, 3].