Geochemistry and the Environment Volume I: The Relation of Selected Trace Elements to Health and Disease (1974) / Chapter Skim
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Pages 21-24
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Annual Conference on Trace Substances in Environmental Health, June 23-25, 1970, D
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II Fluorine MICHAEL FLEISCHER, Chairman Richard M Forbes, Robert C
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TABLE 7 Fluoride Content of Igneous and Sedimentary Rocks Fluoride Content, ppm Rock Type Range Average Igneous Basalts and gabbros 20-1100 400 Silicic rocks, granites 0-2700 750 Alkalic rocks 200-2200 950 Sedimentary limestones and dolomites 0-1210 230 Sandstones 10-880 180 Shales 10-7600 800 Oceanic sediments 100-1600 730 Volcanic ash 10-2900 750 Soils 10-7000 280 Plants can take up fluoride from soil, water, or air. Most plants contain 0.1-10 ppm (dry wt)
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24 THE RELATION OF SELECTED TRACE ELEMENTS TO HEALTH AND DISEASE species and the form in which fluoride occurs. Some plants show foliar lesions at tissue fluoride concentrations of 20150 ppm, but more tolerant species may have as much as 4,000 ppm or more without apparent injury.
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