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Environmental fate & pathways

Adsorption / desorption

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Description of key information

According to Annex IX, Section 9.3.3, column 2 of REACH Regulation (EC) No 1907/2006 a study on adsorption/desorption need not be conducted, If based on the physicochemical properties the substance can be expected to have a low potential for adsorption. The substance can be expected to have a low potential for adsorption (following REACh guidance Document R7.1.15.4): A log kow of 1.78 was determined which indicates low potential for adsorption to soil (log Pow < 3). Additionally, the substance has no cationic properties.

Key value for chemical safety assessment

Additional information

According to Annex IX, Section 9.3.3, column 2 of REACH Regulation (EC) No 1907/2006 a study on adsorption/desorption need not be conducted, If based on the physicochemical properties the substance can be expected to have a low potential for adsorption.The substance can be expected to have a low potential for adsorption (following REACh guidance Document R7.1.15.4): A log kow of 1.78 was determined which indicates low potential for adsorption to soil (log Pow < 3). Additionally, the substance has no cationic properties.

In addition a QSAR-calculation was performed:

The logKoc was determined to be 2.77 using KOCWIN v2.00 log Kow method. The measured log Kow = 1.78 was used. The retrieved calculated logKoc is below the threshold value at 3 and indicates low potential for adsorption to soil (REACh guidance Document R7.1.15.4).

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. 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 CAS 81-77-6 (Q)SAR results were used for adsorption/desorption. 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.