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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Log Koc > 4.11 

Key value for chemical safety assessment

Koc at 20 °C:
12 770

Additional information

No studies investigating the adsorption/desorption behaviour of 2-Butenedioic acid (E)-, di-C8-18-alkyl esters (CAS 68610-90-2) are available. Using KOCWIN Program (v2.00), log Koc values in the range of 5.27 – 10.70 and 4.11 – 9.32 were calculated for its components, based on log Kow and on the molecular conductivity index (MCI), respectively (Hopp, 2011). These models have no universally accepted definition of model domain, but since the longer chained components (> C8) of this substance are outside the log Kow range of the training set, these results should be taken with caution. The definite values of the longer chained (> C8) components may not be fully reliable, but indicate a high adsorption potential, which is also to be expected based on the high calculated log Kow (8.08 – 17.91) of the components and a low measured water solubility (0.15 < mg/l) of the UVCB substance. However, the component with the shortest hydrocarbon side chain (C8), Dioctyl fumarate, fits in the domain of the training set, and the resulting Koc values of 5.27 (based on Kow) and 4.12 (based on MCI) are reliable. The adsorption potential for the other components of this UVCB substance is expected to be higher, due to the longer hydrocarbon side chains, which indicate a higher lipophilicity of these components.

Based on this information, it can be assumed that the adsorption potential of 2-Butenedioic acid (E)-, di-C8-18-alkyl esters (CAS 68610-90-2) is high.

[LogKoc: 4.11]