Registration Dossier
Registration Dossier
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EC number: 271-347-5 | CAS number: 68541-50-4
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Readily biodegradable: 91% (ThCO2) after 28 d (OECD 301 B)
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
Four GLP guideline studies on the ready biodegradability of 2-ethyl-2-(((1-oxoisooctadecyl)oxy)methyl)-1,3-propanediyl bis (isooctadecanoate) (CAS 68541-50-4) are available. The key study followed OECD guideline 301B using domestic activated sludge as inoculum (Oggier, 2011). The degradation rate was determined by measuring the CO2 evolution of the inoculum. After 28 days of incubation a degradation rate of 91% was determined. Thus the substance is regarded as readily biodegradable according to OECD criteria. This assumption is supported by a second study set up according to OECD guideline 301B under similar test conditions (Oggier, 2011). In this second study the test substance was also degraded by 91% after 28 days. A third study on the ready biodegradability followed guideline ISO 10708 using domestic activated sludge as inoculum (Richterich and Börner, 1991). The degradation rate was determined by measuring the O2 consumption of the inoculum. After 28 days of incubation a degradation rate of 75% was determined. A further study investigated the ready biodegradability of the substance under anerobic conditions (Wierich, 1992). The study was performed according guideline ECETOC Anaerobic Biodegradation. The test substance was inoculated with digested sludge. The calculation of the degradation rate is based on CH4 evolution and analysis of inorganic carbon. After 49 days a total of 18.8 ± 9.9% biodegradation was reported of which 12.3% are due to methane production and 6.6% are due to DIC production. Based on the available study results the substance is regarded as readily biodegradable according to OECD criteria.
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