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Environmental fate & pathways

Adsorption / desorption

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Description of key information

log Koc > 5 (KOCWIN v2.00)

Key value for chemical safety assessment

Additional information

No studies investigating the adsorption/desorption behaviour of 2-ethylhexyl oleate (CAS 26399-02-0) are available. Using KOCWIN Program (v2.00), log Koc values of 6.5 and 7.2 were calculated for the based on molecular connectivity index (MCI) and log Kow, respectively (Kamapara, 2013). These models have no universally accepted definition of 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 may not be fully reliable, but indicate a high adsorption potential, which is also to be expected based on the high Kow (> 10) and low water solubility (< 1 mg/L). Additionally, log Koc was calculated for the substance ethylhexyl laurate (CAS No. 20292-08-4), which has the same structure as 2-ethylhexyl oleate, except for the shorter fatty acid chain (water solubility 0.001 mg/L; log Kow 8.0). Ethylhexyl laurate fits in the domain of the training set, and the resulting Koc values 5.3 (based on Kow) and 4.9 (MCI) are reliable. The adsorption potential for 2-ethylhexyl oleate is expected to be higher, due to the length of the fatty acid chain. Based on this information, it can be assumed that the adsorption potential of the 2-ethylhexyl oleate is high.

Additionally, an experimental study, conducted according to EU method C.19, is available for the read-across substance Fatty acids, C16-18 and C18 unsaturated branched and linear, butyl esters (CAS No. 163961-32-8). The log Koc was determined to be > 5.63, which supports the calucated values.