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The Removal Of Fluoride From Drinking Water Supplies
March 11, 2010
•Article: The Removal Of Fluoride From Drinking Water Supplies
By Pureflow Filtration Division
Fluorides are derived from fluorine, a gaseous halogen element in group VIIA of the periodic table of the elements. Fluorine, atomic symbol F, CAS No. 7782-41-4, atomic number 9, atomic weight 18.998, with no known other stable isotopes, has a valence of "1", and is the most electronegative element of all, and the most powerful oxidizing agent known.
Fluorine, a pale yellow diatomic gas or liquid, depending on temperature, has a pungent odor, a boiling point of – 188oC, a freezing point of – 219oC, and a gas density of 1.695. Since fluorine reacts vigorously, frequently involving ignition, with most utilizable substances at room temperature to form fluorides, with all elements except helium, neon and argon, it is never found in its elemental state in nature, only in the form of fluorides.
Most of these compounds are complexes of calcium, fluorine and phosphorus, such as cryolite, fluorspar, and fluorapatite which are found in the U.S.A., Canada, Mexico, parts of Europe, and South Africa. Fluorine can be derived commercially by the Moissan process, the electrolysis of a mixture of hydrogen fluoride and potassium hydrogen fluoride. Uses of fluorine include the production of metallic and other fluorides, fluorocarbons, as well as the active constituents of fluoridating compounds used in drinking water and dentifrices.
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