Registration Dossier
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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.
Bioaccumulation: aquatic / sediment
Administrative data
Link to relevant study record(s)
Description of key information
Silica and silicates are taken up by aquatic species. Silicic acid is known to be the major bioavailable form for aquatic organisms and it plays an important role in the biogeochemical cycle of Si. Most living organisms contain at least trace quantities of silicon. For some species Si is essential element taken up actively, while for others Si is not essential but still taken passively and need to be excreted out (or passivated by way or other). Many species like diatom algae, radiolarians, flagellates, sponges and gastropods have silicate skeletal structures. In general, the intrinsic potential of silica to bioconcentrate is low (low BCF values, even if the relevance of determining these aquatic BCF factors is also low, not determined/given).
Key value for chemical safety assessment
Additional information
Dissolved Si is in surface water as undissosiated neutral molecule Si(OH)4. It has very low calculated octanol water partition coefficient value (Log Kow (KOWWIN v1.67 estimate) = -4.32). It must be pointed out, that Log Kow is a parameter reflecting bioconcentration potential and applicable mainly for organic substances. Applying it for silicic acid is therefore questionable and is used here only for illustrative purposes. The calculated value still gives some indication of the properties of the substance (bioconcentration, absorption, adsorption etc.) even if the substance is inorganic.
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