a.1.(Chem.) Pertaining to, or denoting, a compound consisting of a double fluoride of hydrogen and silicon; silicofluoric. See Silicofluoric.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
has acquired all of the outstanding stock of US-based hydrofluosilicic acid supplier Key Chemical, Inc., the company said on Friday.
When it is artificially added to water supplies by local water treatment plants, it is usually in the forms of hydrofluosilicic acid, sodium silicofluoride or sodium fluoride, which are commonly sourced from phosphate fertiliser manufacturers or aluminium smelters.
The phosphate fertilizer industry captures hydrofluosilicic acid and uses what would otherwise be an air or water pollutant as a low-cost source of fluoride for water authorities.
In the United States, several agents are used for fluoridation, including silicofluoride compounds (sodium silicofluoride and hydrofluosilicic acid) and sodium fluoride.
Besides, the substances that are used to fluoridate do not occur naturally, such as hydrofluosilicic acid.
In addition, the water is treated with chlorine gas to reduce bacteria and with hydrofluosilicic acid to fluorinate the water.
Fluoridation chemicals, such as hydrofluosilicic acid and others, are added to municipal water to reduce incidence of tooth decay.
EPA has stated (27) that it regards the use of waste hydrofluosilicic acid, recovered from phosphate fertilizer manufacturing, in fluoridation systems as "an ideal environmental solution to a long-standing problem," because "water and air pollution are minimized, and water utilities have a low-cost source of fluoride available to them."
Noting that "the substances most widely used for water fluoridation programs are hydrofluosilicic acid and silicofluorides," Bock's bill would require that any fluoridation compounds added to public water supplies first must, (1) be approved by the US Food and Drug Administration and, (2) be tested to assure that "any complex combination of elements is broken down into harmless components when introduced into actual conditions found in end-result tap water." AB 1729 also would mandate that "no substance classified as a pesticide or hazardous waste shall be added to the public drinking water system."
The plant, out of convenience, added hydrofluosilicic acid (HFS) as a fluoridation chemical at the same point as the coagulant and polyelectrolytes.
Founded in 2002, Key Chemical specialises in blends of hydrofluosilicic acid that are UL certified to meet NSF/ANSI Standard 60 for use in water treatment fluoridation.