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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Koc and log Koc >430000 and >5.6, respectively, at pH 2; Koc and log Koc of 73 % of the test material 18 to 430000 and 2.0 to 5.4, respectively, at pH 7; OECD 121 and EU Method C.19

Key value for chemical safety assessment

Koc at 20 °C:
18

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 2 and 7.


At pH 2, solutions of one reference material based on soil adsorption data 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.


At pH 7, solutions of reference materials with known log Koc values based on soil adsorption data and the test material were analysed. The capacity factor (k') of each compound was calculated from its retention time. The log k’ values of the references materials were plotted against the known log Koc values. A linear regression program was used to calculate the calibration curve. Linear regression analysis was performed using the least squares method. The correlation coefficient (r) was calculated.


The log Koc value for the test material was calculated by substituting its mean log k’ in the calibration curve. The value of log Koc obtained from duplicate measurements was within ± 0.25 log units.


Under the conditions of this study, the Koc and log Koc of the test material were determined to be >430000 and >5.6, respectively, at pH 2. The Koc and log Koc of 73 % of the test material were determined to be 18 to 430000 and 2.0 to 5.4, respectively, at pH 7.


 


Further Information


In accordance with Annex XI, Section 2 of the REACH regulation the registrant proposes to waive the testing to determine further information on adsorption/desorption as testing is not considered to be technically feasible due to the intrinsic nature of the substance as a multi-constituent. Furthermore, whilst it is theoretically possible that such studies could be run 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 nature of the substance’s composition.


Furthermore, the exposure scenarios developed in the chemical safety report as the results of the chemical safety assessment indicate there is no need to investigate further effects on the aquatic environment as there is no release to the environment and thus the grounds to waive the study are strengthened in accordance with the general adaptations set out in Annex XI, Section 3 of the REACH regulation.


 


[LogKoc: 2.0]