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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption / desorption: Very high adsorption predicted (QSAR).

Key value for chemical safety assessment

Additional information

A predicted log Koc value of 6.0 was determined using a validated predictive method. The result is considered to be reliable.

Using expert judgement, the substance was found to fall in the applicability domain of the model as defined in the QMRF (PFA, 2014) because:

a.     The substance and prediction are just outside the applicability domain defined in Section 5.1 of the QMRF (Observed log Koc= 1.09 – 5.26; Predicted log KOC= 1.07 – 5.36; log Kow= 2.6 – 8.2). In addition, no fluorinated compounds are in the training set. However, the prediction is considered sufficient to indicate that the Kocis very high.

b.     The structural category of the substance is represented in the training set.

c.      No non-standard mechanisms affecting log Koc are envisaged.

In addition, testing is considered technically not feasible due to the very low water solubility (1.3E-06 mg/l) and very high log Kow (9) of the substance.