Registration Dossier
Registration Dossier
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EC number: 211-659-0 | CAS number: 682-01-9
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Biodegradation in water: screening tests: 98% biodegradation (DOC removal) in 28 days (EU C.4-A), read-across from an analogous substance. No biodegradation is expected for the silanol hydrolysis product, silicic acid.
Key value for chemical safety assessment
Additional information
There are no reliable ready biodegradation data available for tetrapropyl orthosilicate, therefore good quality data for the analogous substance, tetraethyl orthosilicate (CAS 78 -10 -4), have been read across. Both substances share the same hydrolysis product, silicic acid
; the other hydrolysis products being propanol and ethanol, respectively, both of which are readily biodegradable.Tetrapropyl orthosilicate and tetraethylorthosilicate are within an analogue group of substances within which, in general, the substances are readily biodegradable, as all carbons in the structure are associated with alkoxy/acetoxy groups, which hydrolyse and biodegrade within the timescale of the ready biodegradability tests.
It is therefore considered valid to read-across the results for tetraethyl orthosilicate to fill the data gap for the registered substance. Additional information is given in a supporting report (PFA, 2013g) attached in Section 13 of the IUCLID 5 dossier.
Tetraethyl orthosilicate attained 98% biodegradation in 28 days. This biodegradation is atttributable to the biodegradation of the ethanol hydrolysis product, which is readily biodegradable. Biodegradation is not relevant for the inorganic silanol hydrolysis product, silicic acid ; it is the water soluble form of inorganic silicon and will enter the natural biogeochemical cycle for silicon.
The study is considered to be reliability 1 (reliable without restrictions); the read across of the result is considered to be reliability 2 (reliable with restrictions).Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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