Registration Dossier
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EC number: 242-560-0 | CAS number: 18765-38-3
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Biodegradation in water: screening tests: 83-98% in 28 days (OECD 301 B; CO2 evolution). The silanol hydrolysis product is inorganic, therefore biodegradation is not relevant.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
The test substance was biodegraded by 83% (10 mg/l) and 98% (20 mg/l) within 28 days, determined in a reliable study conducted according to an appropriate test protocol. The substance hydrolyses rapidly (t½ = 4 hours at pH7 and 25°C) to monosilicic acid and 2 -butoxyethanol. The biodegradation observed in the study is attributable to the biodegradation of the 2 -butoxyethanol hydrolysis product. 2 -Butoxyethanol is readily biodegradable (OECD, 1997).
Monosilicic acid exists only in dilute aqueous solutions and readily condenses at concentrations above approximately 100 - 150 mg/l as SiO2to give a dynamic equilibrium between monomer, oligomers and insoluble polysilicic acid. These are naturally-occurring inorganic substances and degradation studies are not relevant. These silanol hydrolysis products will enter the natural biogeochemical cycle for silicon.
Reference: OECD (1997) OECD SIDS Initial Assessment Report for 6th SIAM (Paris, 9-11 June 1997). Chemical Name: 2-Butoxyethanol; CAS No.: 111-76-2; Sponsor Country: Australia.
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