Registration Dossier
Registration Dossier
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EC number: 306-522-8 | CAS number: 97281-23-7
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Readily biodegradable (95% biodegradation after 28 days based on CO2 evolution; OECD 301B); read-across
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
Since no studies investigating the ready biodegradability of fatty acids, C16-18, 2-hydroxyethyl ester, (CAS 97281-23-7) are available, in accordance to Regulation (EC) No. 1907/2006 Annex XI, 1.5, a read across to the UVCB substance containing structurally related fatty acids, C16-C18 ester, with diethylene glycol (CAS 85116-97-8) was conducted (Best, 2015). This study was performed according to OECD 301 B (GLP) under aerobic conditions using non adapted, activated sludge from a municipal sewage treatment plant as inoculum and a test substance concentration of approx. 10 mg/L based on DOC. A mean biodegradation of 95% (based on CO2 evolution) was observed after driving off any inorganic carbonates at 29 d, what covers the degradation appeared after 28 days. Since the item exceeded the pass level of 60% within the 10-day window the substance is stated to be readily biodegradable according to the OECD criteria.
To support the above mentioned result two further read across studies were used (CAS 91031-31-1 and CAS 627-83-8). In the first study ethylenglycol distearat palmitate was tested (CAS 91031-31-1) and the study was conducted according to ISO 10708 (determination of biochemical oxygen demand in a two-phase closed bottle test) (Richterich, 1998).Non-adapted, predominantly domestic sewage sludge was used and exposed to an initial test substance concentration of 100 mg/L (based on COD).The substance was ready biodegradable with 61% within 28 d (based on O2 consumption) and the 10-day window was passed.In the second supporting study the biodegradability of a stearic acid, ethylene ester (CAS 627-83-8) was tested according to OECD 301 C (MITI, 1998). A mixture of activated sludge from STP with freshwater from rivers and lakes, marine water and marine sediment was used as well as an initial test concentration of 100 mg/L. The substance was found to be ready biodegradable with 73% within 28 d.
In conclusion, fatty acids, C16-18, 2-hydroxyethyl ester, (CAS 97281-23-7) can be considered to be readily biodegradable based on the results from the suitable read-across substances (in accordance to Regulation (EC) No 1907/2006 Annex XI, 1.5).
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