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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The adsorption coefficient (Koc) of the test item has been determined to be greater than log10 Koc >5.63.

Key value for chemical safety assessment

Koc at 20 °C:
427 000

Additional information


The determination was carried out using the HPLC screening method, designed to be compatible with Method C19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for Testing of Chemicals, 22 January 2001.


Only two peaks were detected in the analysis. This is most likely due to co-elution of the three esterification products due to the high organic content of the mobile phase to elute the components.

The method guideline states that the measurement of adsorption coefficient should be carried out on substances in their ionised and unionised forms. Predicted dissociation constants for the test item are in the region of 3.6 to 4.6 and so there is potential for some ionised species to be present in the environmentally relevant pH range above 5.5. However, analysis of cationic substances is not valid due to secondary interactions with the stationary phase of the column. Therefore, testing was carried out at approximately neutral pH with the functional groups unionised.


The adsorption coefficient (Koc) of the test item has been determined to be greater than 4.27 x 105 (log10 Koc >5.63).

[LogKoc: 5.63]