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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Link to relevant study record(s)

Description of key information

log Koc > 5 (KOCWIN 2.00)

Key value for chemical safety assessment

Additional information

No studies investigating the adsorption/desorption behaviour of Fatty acids, C16-18 and C18-unsaturated, 2-ethylhexyl esters (CAS 85049-37-2) are available. Using KOCWIN Program (v2.00), log Koc values of 5.9, 6.5 and 6.5 were calculated for the C16, C18 and C18:1 constituents, respectively, based on molecular connectivity index (MCI). These models have no universally accepted definition of model domain, but since the constituents are 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 < 0.05 mg/L at 20 °C and pH 6.7). Additionally, log Koc was calculated for the substance ethylhexyl laurate (CAS No. 20292-08-4), which has the same structure as Fatty acids, C16-18, 2-ethylhexyl esters, 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 Fatty acids, C16-18 and C18-unsaturated, 2-ethylhexyl esters 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 Fatty acids, C16-18 and C18-unsaturated, 2-ethylhexyl esters 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.