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EC number: 304-780-6
CAS number: 94279-36-4
Not readily biodegradable: 20.7 - 45% (CO2 evolution) in 28 days based on read across (EU method C.4-C)Enhanced ultimately biodegradable: 71.4 - 78% (CO2 evolution) in 40 - 50 days based on read-across (EU method C.4-C)
Two studies for 2,4-Benzenetricarboxylic acid, tri-C9-11-alkyl esters (CAS No. 94279-36-4) are available. However, these studies are not appropriate to assess the biodegradability of 1,2,4-Benzenetricarboxylic acid, tri-C9-11-alkyl esters (CAS No. 94279-36-4), because (i) a product is tested and no further information about the tested substance is given, (ii) a method is used which substantially differ from current guidelines (CEC-L-33-T-82) and (iii) only a short abstract is available which makes it impossible to verify the reliability and accuracy of the provided test results.
The assessment was therefore based on studies conducted with the analogue substance 1,2,4-Benzenetricarboxylic acid, mixed decyl and octyl triesters (CAS No. 90218-76-1) as part of a read across approach, which is in accordance with Regulation (EC) No. 1907/2006. Annex XI, 1.5. For each specific endpoint the source substance(s) structurally closest to the target substance is/are chosen for read-across, with due regard to the requirements of adequacy of the available data. Structural similarities and similarities in properties and/or activities of the source and target substance are the basis of read-across. A detailed justification is provided in the technical dossier (see IUCLID Section 13). Please consider that the originally proposed category approach addressing all Polyfunctional acid esters (PFAE) aromatic is currently under revision and will finally result in an analogue approach for the registration. Therefore, two documents, the category justification and explanatory notes for the analogue approach are provided in Section 13.
For 1,2,4-Benzenetricarboxylic acid, mixed decyl and octyl triesters (CAS No. 90218-76-1) two ready biodegradability studies are available. Both GLP studies were performed according to EU method C.4-C. Initial test concentrations of 14.8 and 14.95 mg/L (TOC) were applied. Based on CO2 evolution mean degradation rates of 45% and 20.7% were observed after 28 days. Hence, the substance is not readily biodegradable according to OECD criteria. Nevertheless, the test duration was extended to 43 and 48 days, respectively, resulting in overall biodegradation rates of 71.4 - 78% in the enhanced ready biodegradation test.
Based on the data above, 1,2,4-Benzenetricarboxylic acid, tri-C9-11-alkyl esters (CAS No. 94279-36-4) can be considered as not readily biodegradable according to OECD criteria. However, it could be demonstrated that the biodegradation continued beyond the 28 day test period, which resulted in a biodegradation rate above the pass level of > 60% (CO2 evolution) after a test period of 43 and 48 days, respectively. This indicates that the test substance is enhanced ultimately biodegradable according to the criteria described in Section R.126.96.36.199 of the "Guidance on information requirements and chemical safety assessment -Chapter R.7b: Endpoint specific guidance" (ECHA, 2017).
As the screening criteria for persistency listed in table R.11-2 of the “Guidance on information requirements and chemical safety assessment: Chapter R.11: PBT assessment (ECHA, 2017) are passed under the strict conditions of enhanced biodegradation tests, it can be concluded that the test substance is not persistent in the environment.
Due to the structural and property similarities with the tested category member 1,2,4-Benzenetricarboxylic acid, mixed decyl and octyl triesters (CAS No. 90218-76-1) the results are applicable to read across to 1,2,4-Benzenetricarboxylic acid, tri-C9-11-alkyl esters (CAS No. 94279-36-4).
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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