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Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Link to relevant study record(s)

Description of key information

Adsorption of the substance to solid soil phase is not expected.

Key value for chemical safety assessment

Additional information

According to Regulation (EC) 1907 (2006) Annex VIII, section 9.3.1, column 2, a study on adsorption potential does not need to be conducted as the substance has a low potential for adsorption. The substance has an experimentally determined log Kow of  1.96 (@ pH 6.8, BASF AG, 1993, study no.: 93P00080; see IUCLID Ch. 4.7).

However, data on the adsorption potential of the substance are available from a peer-reviewed publication based on a HPLC method with natural sorbents (soil and peat).The study was supported by the EU integrated project NoMiracle (Novel Methods for integrated Risk Assessment of Cumulative stressors in Europe). In this study, the sorption of soil organic matter was tested with three different types of soil (Eurosoil 3, Eurosoil 4 and Eurosoil 5) along with a peat (Pahokee peat). For the peat columns the pH of the mobile phase was adjusted to 7.2. The resulting Koc values for the substance in the different matrices were determined to be in the range between 1.32 and 1.48 (pH 5.8 – 7.2, 25 °C, Bronner & Goss, 2011). The documentation of this peer-reviewed publication is sufficient to select this study as key information for the assessment of the adsorption potential of 2,6 -xylidine.

It can be concluded that the substance is not expected to adsorb to the solid soil phase. In addition, the substance will not be ionized under the environmental conditions (pKa = 4.17, see IUCLID, Ch. 4.21); therefore, its low log Kow (log Kow < 3) supports the conclusion that adsorption of the substance is not to be expected.