Registration Dossier
Registration Dossier
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EC number: 931-468-2 | CAS number: 1190625-94-5
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Koc and log Koc >430000 and >5.63, respectively; OECD 121 and EU Method C.19
Key value for chemical safety assessment
- Koc at 20 °C:
- 430 000
Additional information
The adsorption coefficient of the test material was investigated in accordance with the standardised guidelines OECD 121 and EU Method C.19 under GLP conditions using the HPLC estimation method. The study was awarded a reliability score of 1 in accordance with the principles for assessing data quality set forth by Klimisch et al. (1997).
According to the guidelines, the determination of the Koc for test materials that are ionised for at least 10 % within pH 5.5 to 7.5 should be performed with both the ionised and non-ionised form. Therefore, analysis was performed at pH 7.
Solutions of one reference material based on soil adsorption data (4,4’-DDT) and the test material were analysed. Based on the retention times of the compounds the Koc and log Koc values of the test material were determined.
Several test material peaks were observed in the chromatogram of the test material solution, which all had a retention time longer than the reference material 4,4’-DDT. Hence, it was concluded that the log Koc of test material was greater than the value for 4,4’-DDT, i.e. > 5.63.
Under the conditions of this study, the Koc and log Koc of the test material were determined to be >430000 and >5.63, respectively.
Further Information
In accordance with Section 2 of Annex XI of the REACH regulation, the registrant proposes to waive the testing to determine further information on adsorption/desorption as required in Section 9.3.3. of Annex IX as testing is not considered to be technically feasible due to the intrinsic nature of the substance. The material is a complex multi-constituent substance with a low water solubility, which in itself can be considered to justify omission of the study. Whilst it is theoretically possible that such studies could be carried out using radio-labelled test material, for complex materials such as this, it is not considered technically feasible to generate such radio-labelled samples due to the substance’s composition.
Furthermore, the exposure scenarios developed in the chemical safety report as a result of the chemical safety assessment indicate that there is no need to investigate further effects on the aquatic environment as there is no release to the environment; thus the grounds to waive the study are strengthened in accordance with the general adaptations set out in Section 3 of Annex XI of the REACH regulation.
[LogKoc: 5.63]
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