Registration Dossier
Registration Dossier
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EC number: 232-263-4 | CAS number: 7803-62-5
Endpoint summary
Administrative data
Description of key information
Distribution modelling for this substance is not possible using standard models as no log Kow or water solubility and biodegradation values are available.
Additional information
No information, measured or modelled is available about the distribution of silane in the environment. Silicon-containing species that may be formed from the reaction of silane with air and water are tetrahydroxysilane (silicic acid) or silica.
Literature is available on the fate of dissolved silica in the aquatic environment. No differentiation is made with respect to its origin (man-made or natural), or structure (crystalline or amorphous), and once released and dissolved into the environment no distinction can be made between the initial forms of silica. At normal environmental pH, dissolved silica exists exclusively as monosilicic acid [Si(OH)4]. Silicic acid is the bioavailable form for aquatic organisms and it plays an important role in the biogeochemical cycle of Si, particularly in the oceans (ECETOC 2006).
The quantity of dissolved silica in European rivers is estimated to be 0.728 Tmol Si/y or 4374 kt SiO2/y (ECETOC, 2006). Therefore, the potential release of silica resulting from use of silane is negligible compared to the natural flux of silica in the environment.
Reference:
ECETOC (2006). Synthetic Amorphous Silica (CAS No. 7631-86-9), JACC No. 51, ECETOC, 2006.
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