Registration Dossier
Registration Dossier
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EC number: 500-047-1 | CAS number: 26316-40-5 1 - 4.8 moles ethoxylated and 1 - 8.5 moles propoxylated
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Biodegradation (OECD 301F and 302B): inherently biodegradable, not fulfilling specific criteria.
Key value for chemical safety assessment
Additional information
Biodegradation in water was tested in two screening studies, according to OECD guideline 301F ("ready biodegradability") and 302B (inherent biodegradability). EDA EO PO showed limited mineralisation in the stringent 301F test but in the 302B test 48.5% biodegradation was observed. It was concluded that the EDA EO PO exhibits inherent (primary) biodegradability, not fulfilling specific criteria.
The predicted microbial metabolites of the UVCB substance components are shown to have log Pow values well below the screening criterion for B, and are thus concluded to be not B, not vB. Furthermore, the metabolites are predicted to have acute aquatic E/LC50 values which are > 100 mg/L, or higher than those determined for the tested UVCB mixture. Although the tested UVCB substance does not meet OECD criteria for "ready biodegradability", predicted microbial metabolism of the UVCB components and all predicted metabolites, according to understood and documented pathways, proceeds ultimately to CO2. Additional simulation testing is not required to inform ecological risk assessment, or PBT assessment, of the UVCB substance and its associated components and degradation products.
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