Search results
20 sty 2021 · High fluoride environmental levels can occur because of volcanic eruptions, natural transport conveyed by air and water, and weathering. In addition, fluoride enters the GW through the dissolution of fluoride-rich rocks and minerals (e.g. fluoroapatite, fluorspar, sellaite, and villiaumite).
22 lis 2021 · Purely inorganic fluorine compounds, those in which C–F bonds are absent or play no major role, are found with crystalline, glassy, or nanostructured morphology, in the liquid state (or solution), or in the gas phase.
6 lip 2024 · Secondly, HF reacts with silica so any putative surface reservoir of liquid HF would react with crustal rocks to form fluorides and water.
24 sty 2023 · Fluoride is also one of the pollutants commonly found in water. Fluoride is a highly electronegative and monoatomic anionic form with the chemical formula F - . It acts as a hard Lewis base complexed with other compounds, leading to its accumulation in rocks, i.e., fluorapatite, sellaite, and cryolite.
18 sie 2014 · The perfluorinated chains were found to form helices and double helices producing highly ordered liquid crystals within the hydrophobic environments . This property is of high importance considering ordered self-assembly of biological molecules and molecular machines.
22 lis 2021 · Another particularly important fluoride mineral is fluoroapa-tite, Ca5(PO4)3F. Not only is it the most common phosphate mineral, but it also is a component of tooth enamel along with hydroxyapatite, Ca5(PO3)3(OH), bridging the inorganic and (bio)organic signi cance of uorine in Nature.
20 sie 2016 · Fluoride, an incompatible lithophile and the most electronegative element, forms a number of soluble, pH-dependent formation of complexes with polyvalent metal ions in water. The interaction between water and sedimentary carbonates ultimately causes fluoride...
