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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption to solid soil phase is expected.

Key value for chemical safety assessment

Additional information

QSAR-disclaimer

 

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.

 

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 Tridecylamine, branched and linear (CAS 86089-17-0) (Q)SAR results were used for the estimation of the adsorption potential. 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 the adsorption potential are not provided.

 

Assessment:

To assess the adsorption potential of tridecylamine, branched and linear (CAS 86089 -17 -0) no experimental data exist. Therefore, the Koc value was estimated using a scientifically acceptable calculation method. At environmentally relevant conditions, tridecylamine will be present in its ionised form (pKa = 8.8, BASF SE, 2018, report no.: 18L00175, see IUCLID Ch. 4.21). Therefore, the adsorption coefficient was calculated according to Franco & Trapp (2008, 2009, 2010) to correct for the charged molecule at pH 5, 7, and 8. This pH range is representative for 98% of the European soils. The substance is within the applicability domain of the model. The Koc values of the Franco & Trapp method give a good indication on the adsorption potential of a substance depending on the pH conditions of soil. The method is based on the dissociation constant pKa and the log Kow for the uncharged molecule. The resulting Koc at pH 7 is 12714 L/kg and the log Koc is 4.1, respectively, at pH 5 and 8 the resulting Koc is 12874 L/kg and 11460 L/kg, and the log Koc is 4.11 and 4.06.

 

It can be concluded that adsorption of the substance to the solid soil phase is expected.