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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 stearate (CAS No. 22047-49-0) are currently available. Using KOCWIN Program (v2.00), log Koc values of 7.27 and 6.47were calculated, based on log Kow and on molecular connectivity index (MCI), respectively. These models have no universally accepted definition of model domain, but since the substance is outside the Kow range of the training set for both models, 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). Additionally, log Koc was calculated for a similar substance, ethylhexyl laurate (CAS No. 20292-08-4), which has the same structure as ethylhexyl stearate, 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 stearate 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 stearate is high.