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Environmental fate & pathways

Adsorption / desorption

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Description of key information

logKoc: > 5 (KOCWIN v2.00)

Key value for chemical safety assessment

Additional information

No studies investigating the adsorption/desorption behaviour of ethylene distearate (CAS 627-83-8) are available. Using KOCWIN Program (v2.00), log Koc values of 9.71 and 8.80 were calculated, based on log Kow and on molecular connectivity index (MCI), respectively (Müller, 2011). 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 (4.24E-12 mg/L).

Additionally, the log Koc was calculated for the read-across substance decanoic acid, mixed diesters with octanoic acid and propylene glycol (CAS 68583-51-7), which has a similar structure as ethylene distearate (water solubility < 0.05 mg/L; log Kow 5.12). The read-across substance fits in the domain of the training set, and the resulting Koc values 3.79 - 4.83 (MCI) and 4.51 - 5.59 (based on log Kow) are reliable. The adsorption potential for ethylene distearate 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 ethylene distearate is high.