Registration Dossier
Registration Dossier
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EC number: 291-759-9 | CAS number: 90480-27-6
Endpoint summary
Administrative data
Description of key information
Additional information
In accordance with REACH Annex IX, section 9.3.2, column 2, experimental investigation is unnecessary if the substance has a low potential for bioaccumulation. The average molecular weight for the most abundant basic form of the test item is 1972 g/moL and, because this is higher than 1100 g/moL, it provides an indicator that the aquatic BCF of the undissociated substance is lower than 2000 L/kg (see ECHA Guidance on Information requirements and chemical safety assessment Chapter R11: PBT assessment (Version 2.0; November 2014). With the exception of octadec-9-enoic acid (oleic acid), dissociated components of the UVCB have a molecular weight range of > 1500 g/moL to 2034 g/moL and the aquatic BCF for those moieties is also expected to be lower than 2000 L/kg.
Log Kow for free oleic acid has been calculated as 7.73 and ECHA guidance on determination of bioaccumulation potential states that, at very high Log Kow (> 6), a decreasing relationship between BCF and Log Kow is observed. This conclusion is underpinned by a calculated BCF of 56.23 L/kg wet weight for oleic acid (BCFBAF v.3.01). Further evidence of very limited uptake stems from the long term Daphnia and algae NOEC values, which are far greater than the determined water solubility of the substance. As a result, bioaccumulation of the substance is not considered to be of concern in the undissociated or dissociated form.
Bioaccumulation of the larger dissociated components of the UVCB test material is unlikely on the grounds of molecular weight and BCF for the dissociated acid has been predicted as less than 2000 L/kg. It can therefore be concluded that the substance as a whole exhibits low potential for bioaccumulation in aquatic species such as fish.
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