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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 Sorbitan, (Z)-9-octadecenoate (2:3) (CAS No. 8007-43-0) are available. Using KOCWIN Program (v2.00), log Koc values from 6.8 to 13.2 were calculated for the different constituents, based on molecular connectivity index (MCI), and 7.5 - 12.8 based on log Kow (Blum, 2012). These models have no universally accepted definition of model domain, but since Sorbitan, (Z)-9-octadecenoate (2:3) 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 log Kow (>10) and low water solubility. Additionally, the results for the corresponding monoester Sorbitan oleate (CAS No. 1338-43-8), which is within the model domain, already indicate high adsorption (log Koc 3.4, based on MCI). It can be assumed that the di- and triesters have even higher adsorption potential, since they contain more fatty acid chains. However, the definite values for Sorbitan esters should still be taken with caution, since the molecular structure indicates a potential of surface active properties, which may further increase the adsorption potential of the substances.

It can be concluded that although the definite values are not fully reliable, the adsorption potential of Sorbitan, (Z)-9-octadecenoate (2:3) to soil is expected to be high.