fluoride

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fluoride,

a salt of hydrofluoric acid; see hydrogen fluoridehydrogen fluoride,
chemical compound, HF, a colorless, fuming liquid or colorless gas that boils at 19.54°C;. It is miscible with water and is soluble in benzene, toluene, and concentrated sulfuric acid.
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. See also fluoridationfluoridation
, process of adding a fluoride to the water supply of a community to preserve the teeth of the inhabitants. Tooth enamel ordinarily contains small amounts of fluorides and when the amount is augmented through the intake of fluoridated water, especially during the
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; fluorinefluorine
, gaseous chemical element; symbol F; at. no. 9; at. wt. 18.9984; m.p. −219.6°C;; b.p. −188.14°C;; density 1.696 grams per liter at STP; valence −1. Fluorine is a yellowish, poisonous, highly corrosive gas.
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.

Fluoride

 

a compound of fluorine with other elements. The fluorides of elements in Groups I and II of Mendeleev’s periodic system are solids with an ionic element—fluorine bond; the fluorides of most elements in Groups VI–VII are gases with a covalent element—fluorine bond. Compounds containing a C—F bond form numerous classes of fluorocarbons; the higher fluorides of many metals, such as U, V, Mo, W, and Re, are volatile substances. Fluorides occur in nature as constituents of minerals. In terms of chemical properties, the fluorides of halogens, inert gases, oxygen, nitrogen, and many other elements in higher oxidation states (for example, PtF5, CoF3, and AgF2) are oxidizing agents; the fluorides of arsenic, antimony, and boron are strong Lewis acids (seeACIDS AND BASES).

Fluorides can be obtained by the interaction of fluorine with elements, by the action of hydrogen fluoride on metals, and by other methods.

Hydrogen fluoride, oxyfluorides, and nitrogen fluorine compounds are widely used. The chlorine fluorides C1F3 and C1F5 are rocket-fuel oxidizing agents; C1F3 also serves as a fluorinating agent in the preparation of uranium hexafluoride, UF6, which is used in the atomic industry for the isotope separation of uranium. The volatile fluorides of metals are used in the application of metallic coatings. The fluorides of lithium, magnesium, calcium, strontium, barium, and other metals are used as raw materials in the manufacture of optical glass. (See alsoCRYOLITE.)

REFERENCES

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A. V. PANKRATOV

fluoride

[′flu̇r‚īd]
(inorganic chemistry)
A salt of hydrofluoric acid, HF, in which the fluorine atom is in the -1 oxidation state.

fluoride

1. any salt of hydrofluoric acid, containing the fluoride ion, F--
2. any compound containing fluorine, such as methyl fluoride
References in periodicals archive ?
A sustained amount of fluoride is released during tea infusion and nearly all the fluorides released are absorbed by consumer.
Distribution of fluorides in ground water of Salem and Namakkal district, Tamilnadu.
How does fluoride act in dental caries preven- tion?
Fluoride interferes with metabolic pathways of bacteria, thus reducing acid.
Key Words: Fluoride; Bioadsorption; Defluoridation; Water purification; Detoxification.
Both surface and ground waters contain different fluoride concentrations depending upon the sources of addition.
In this study, there was a significant decrease in sperm motility (P < 0.001) in group fed with fluoride 20 mg/kg for 28 days as compared with control.
Group I had controls, while Group II rats were exposed to high-dose fluoride. Group I was given drinking water mixed with 0.1 mg/kg/b.w./day of natrium fluoride, while group II was given drinking water mixed with 10 mg/kg/b.w./day of natrium fluoride for 18 days.
Industrial fluorides are added to nearly three-fourths of US public water supplies; therefore substantial amounts of fluoride are also ingested from foods and beverages processed in fluoridated cities.
Results: It was found that fluoride content and pH level vary among the beverages.
* Silver diamine fluoride presents a noninvasive option for caries arrest and treatment when applied directly to dentin caries lesions