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 soil
Administrative data
Link to relevant study record(s)
Description of key information
Waived: Testing is not justified, due to exposure considerations
Key value for chemical safety assessment
Additional information
In accordance with column 2 of REACH Annex IX, degradation simulation testing in soil does not need to be conducted. The substance is used exclusively in manufacture of polymers/elastomers, where it is completely reacted into these products; and as a result will have no direct or indirect exposures to the soil environment. Wastewater exposures to the substance occurs only with industrial sewage treatment works associated with the manufacture site. According to EU regulations, wastewater biosolids from the industrial STP are not applied to soil.
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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