 CCRSM (2010)  Resumen & Detalles: Media Consulta   2. What
happens to fluoride in your body?  The SCHER opinion states:
Hexafluorosilicic acid and hexafluorosilicates are the most
commonly used agents in drinking water fluoridation and it has
been claimed that incomplete dissociation of these agents in
drinking water may result in human exposure to these chemicals.
The toxicology of these compounds is incompletely investigated.
Recent studies have addressed the equilibrium of the free
fluoride ion and fluorosilicate species in aqueous solutions
over a wide concentration and pH range. In the pH-range and at
the concentrations of hexafluorosilicates/fluoride relevant for
drinking water, hydrolysis of hexafluorosilicates to fluoride
was rapid and the release of the fluoride ion was essentially
complete. Residual fluorosilicate intermediates were not
observed by sensitive 19F-NMR. Other hydrolysis products of
hexafluorosilicate such as Si(OH)4 are rapidly transformed to
colloidal silica (Finney et al. 2006). Si