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USER COMMENTS BY “ LOOKS LIKE IT OCCURS NATURALLY ” |
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| RECENTLY-COMMENTED SERMONS | More | Last Post | Total |
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 2/25/15 11:11 PM |
| Looks like it occurs naturally | | also | |  |  |
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Fluoride in most groundwaters occurs as the anion F–. Waters with high fluoride content are found mostly in calcium-deficient ground waters in many basement aquifers, such as granite and gneiss, in geothermal waters and in some sedimentary basins. Groundwaters with high fluoride concentrations occur in many areas of the world including large parts of Africa, China, the Middle East and southern Asia (India, Sri Lanka). One of the best known high fluoride belts on land extends along the East African Rift from Eritrea to Malawi. There is another belt from Turkey through Iraq, Iran, Afghanistan, India, northern Thailand and China. The Americas and Japan have similar belts.Fluoride is found in vegetables, fruit, tea and other crops. although drinking water is usually the largest contributor to the daily fluoride intake. Fluoride is also found in the atmosphere, originating from the dusts of fluoride-containing soils, from gaseous industrial wastes, from the burning of coal fires in populated areas and from gases of volcanic activity. Thus fluoride, in varying concentrations, is freely available in nature W.H.O. |
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