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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Practical testing according to 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 was not possible due to the acidity of the test item.

Key value for chemical safety assessment

Koc at 20 °C:
0.136

Additional information

Test guidance indicates that the HPLC method may not be applicable to moderate to strong acids. The estimated log10 Koc value was also outside of the calibration range of the reference substances. Therefore, the adsorption coefficient was estimated using a computer-based atom fragment contribution method, KOCWIN, version 2.00, © 2000-2008 U.S. Environmental Protection Agency. Using KOCWIN, version 2.00, the adsorption coefficient of the test item was estimated to be 0.136, log10 Koc -0.866 (Kow method). These values indicate that the test item will have a very high environmental mobility. However, it is anticipated that partitioning forces with the organic carbon content of soils and sediments may not be the dominant force controlling the mobility of the test item in the environment. Strong ionic interaction with clay particles, for example, will also influence the fate of the test item in the environment.