Registration Dossier
Registration Dossier
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EC number: 276-171-2 | CAS number: 71902-01-7
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
log Koc 3.3 - > 10 (KOCWIN v2.00)
Key value for chemical safety assessment
Additional information
No studies investigating the adsorption/desorption behaviour of Sorbitan isooctadecanoate (CAS No. 71902-01-7) are available. Using KOCWIN Program (v2.00), log Koc values from 3.3 to 13.0 were calculated for the different constituents, based on molecular connectivity index (MCI), (Blum, 2012). These models have no universally accepted definition of model domain, but since the triester and diester constituents are outside the Kow range of the training set of the model, the results for these constituents (log Koc 13.0 and 6.9) should be taken with caution. The definite values for the triester and diester 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. Additionally, the results for the monoester, which is within the model domain, already indicate potential to adsorb (log Koc 3.3). It can be assumed that the larger constituents 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 isooctadecanoate to soil is expected to be high.
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