Registration Dossier
Registration Dossier
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EC number: 610-641-3 | CAS number: 512802-65-2
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
A weight of evidence approach is taken to the biodegradation endpoint for the test substance palm oil propoxylated. Three reliable guideline studies are available with a range of substance concentrations tested. The most recent study (Hillier, 2016) used a test concentration of >50 mg/l with a reported biodegradation of 48% over 28 days in an OECD 301F study (Klimisch 1). The OECD 301B guideline study by Brunswick-Titse (2005) reported rapid biodegradation of 73% in 28 days with a test concentration of 33.8 mg/l (Klimisch 1). A further OECD 301B guideline study by Scholz (1993) reported rapid biodegradation of 78% and 76% in 28 days with test concentrations of 10.3 and 20.1 mg/l (Klimisch 1). This final study indicates that even when the test substance concentration doubled, the rate and extent of biodegradation was very similar. When the concentration was effectively tripled in the Brunswick-Titse (2005) study compared to the lowest concentration tested in the Scholz (1993) study, the ultimate biodegradation was only reduced by 5% and remained above 70%. It is concluded that the studies are reliable and that the weight of evidence indicates that the substance is readily biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
- Type of water:
- freshwater
Additional information
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