Registration Dossier
Registration Dossier
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EC number: 242-560-0 | CAS number: 18765-38-3
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption / desorption:
Parent substance: log Koc value of 2.4 at 20 - 25°C.
Hydrolysis product (monosilicic acid): Low potential for adsorption.
Hydrolysis product (2-butoxyethanol): log Koc value of 1.4
Key value for chemical safety assessment
- Koc at 20 °C:
- 250
Additional information
A log Koc value of 2.4 at 20 - 25°C was obtained for the parent substance using a validated QSAR method. The result is considered to be reliable, and is selected as the key study.
Testing of the silanol hydrolysis product monosilicic acid is waived in accordance with Column 2 of REACH Annex IX. The substance is inorganic and has a low potential for adsorption.
The substance is expected to hydrolyse rapidly to 2 -butoxyethanol and monosilicic acid. At concentrations above about 100-150 mg/l as SiO2, condensation products of monosilicic acid can also form. Monosilicic acid is a naturally occurring substance, which will enter the natural biogeochemical cycle for silicon; adsorption/desorption studies are not relevant.
Based on their structure and predicted water solubilities, the silicic acid hydrolysis products will have a high affinity for water and a low affinity for organic carbon and so a low potential for adsorption to the organic carbon. However, they may interact with the mineral content of soil. Amorphous polysilicic acid is a constituent of most soils.
A log Koc value of 1.4 is reported in the EU RAR for the hydrolysis product, 2-butoxyethanol.
EU RAR (2006): European Union Risk Assessment Report, 2-butoxyethanol CAS No.: 111-76-2, Volume 68, 2006.
[LogKoc: 2.4]
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