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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Log Koc > 5 (based on Molecular Connectivity Index (MCI); KOCWIN v2.00)

Key value for chemical safety assessment

Additional information

No studies investigating the adsorption/desorption behaviour of Fatty acids, C18-unsatd., dimers, 2-ethylhexylesters (CAS No. 68334-05-4) are available. Using KOCWIN Program (v2.00), log Koc values in the range of 9.9 to 10.2 were calculated based on log Kow and the molecular connectivity index, respectively (Erler, 2013). This model has no universally accepted definition of its model domain, but since the substance is outside the Kow range of the training set, the results should be taken with caution. The definite values for the substance may not be fully reliable, but indicate a high adsorption potential, which is also to be expected based on the high calculated log Kow value (log Kow > 10, KOWWIN v1.68) and the low measured water solubility of the substance (< 1 mg/L).

Additionally, a log Koc value was calculated for substance Fatty acid, C11, dimer, ester with trimethylolpropane (Hopp, 2012) which has the same structure as the target substance, except for the shorter fatty acid chains. The substance fits in the domain of the training set of the MCI method, and the resulting log Koc value 3.57 (based on MCI) is reliable. The adsorption potential for of Fatty acids, C18-unsatd., dimers, 2-ethylhexylesters is expected to be higher, due to the length of the fatty acid chain. Based on this information, the adsorption potential of the target substance is assumed to be high.