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Environmental fate & pathways

Adsorption / desorption

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Link to relevant study record(s)

Description of key information

Adsorption to the solid soil phase is expected.

Key value for chemical safety assessment

Additional information

In Article 13 of Regulation (EC) No 1907/2006, it is laid down that information on intrinsic properties of substances may be generated by means other than tests, provided that the conditions set out in Annex XI (of the same Regulation) are met. Furthermore, according to Article 25 of the same Regulation testing on vertebrate animals shall be undertaken only as a last resort.

According to Annex XI of Regulation (EC) No 1907/2006 (Q)SAR results can be used if (1) the scientific validity of the (Q)SAR model has been established, (2) the substance falls within the applicability domain of the (Q)SAR model, (3) the results are adequate for the purpose of classification and labeling and/or risk assessment and (4) adequate and reliable documentation of the applied method is provided.

For the assessment of the test substance (Q)SAR results were used for the estimation of the logKoc value. The criteria listed in Annex XI of Regulation (EC) No 1907/2006 are considered to be adequately fulfilled and therefore the endpoint(s) sufficiently covered and suitable for risk assessment.

Therefore, further experimental studies on adsorption / desorption are not provided.

The logKoc value of the test substance was calculated to be 10.38 using EPIWin KOCWIN v2.00 MCI method [BASF SE 2017]. Since the test substance is within the applicability domain of the QSAR model, the result is valid and reliable. This log Koc value indicates that the substance will bind to soil and sediment.

Additionally, the logKoc was calculated using EPIWin KOCWIN v2.00 LogKow method [BASF SE 2017]. The logKoc value was determined to be 9.46. However, the calculated logKow used for this method is outside of the applicability domain of the QSAR model. Therefore, the estimated value is less accurate. Nevertheless, since the value is close to the value determined with the MCI method, it can be used in an overall conclusion to support the outcome that adsorption to the solid soil phase is expected.