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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Log Koc: ≥ 2.95 (KOCWIN v2.00)

Key value for chemical safety assessment

Additional information

No experimental studies investigating the adsorption/desorption potential of 1,2,3-Propanetriol, homopolymer, diisooctadecanoate(CAS 63705-03-3) are available. Therefore, log Koc values were calculated for representative fatty acid components using KOCWIN v2.00 based on the Molecular Connectivity Index (MCI) (Hopp, 2011 and Marwitz, 2012). The models have no universally accepted definition of the model domain, but since some components of the substance are outside the log Kow range of the training set of the MCI method, the results should be taken with caution. The definite values for the components with diester and triester (C18 FA diester (glycerol, diglycerol and triglycerol and C18 FA triester (glycerol)) may not be fully reliable, but indicate a high adsorption potential, which is also to be expected based on the high log Kow (> 10). However, the log Koc value for the monoester (C18 FA monoester (glycerol, diglycerol and triglycerol) are within the training set and the results are fully reliable indicating potential for adsorption (log Koc 2.95 – 3.71, MCI). Since the log Koc increases with the complexity of the substance, it can be assumed that the adsorption potential of the diesters and triesters and therefore for 1,2,3-Propanetriol, homopolymer, diisooctadecanoate is high.