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EC number: 273-761-1 | CAS number: 69012-64-2 Amorphous silicon dioxide particles from the volatilization and vaporization of furnace feed materials in the manufacture of ferrosilicon and silicon.
Endpoint summary
Administrative data
Description of key information
Additional information
Silica fume in its solid particulate form is a completely non-volatile substance. Silica fume is a relatively poorly soluble substance in acidic, neutral and slightly alkaline water (< 1000 mg/L). Dissolved silica is also non-volatile and, therefore, partitions mainly to the aquatic and soil compartments.
In dilute solutions (< 100 mg/l) silica is present as dissolved Si(OH)4, and in more concentrated solutions as dimerized, trimerized, colloidal or in the form of aggregated colloids of different physical size or entirely as insoluble solid particulate matter.
The soluble specie Si(OH)4is known to be relatively mobile in soil. The adsorption of dissolved silica to soil inorganic fraction is generally not strong and to soil organic matter weak or almost insignificant. However, the adsorption to mineral fraction may have several mechanisms and be highly dependent on the soil mineral composition. The mineral composition of soil normally contains a high proportion of Si minerals. A very strong binding of silica to soil materials may take place if dissolved silica species form precipitates with other elements like Al and Mg and form several types of clay minerals with these elements.
A dynamic adsorption/desorption equilibrium between soil/sediment particles and water keeps the surface water and soil pore water concentrations of dissolved silica relatively constant (ca. 2-15 mg/l). Higher concentrations can be found in groundwater.
Amorphous silica does not bioconcentrate remarkably, is not bioaccumulative and does not biomagnify.
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