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Environmental fate & pathways

Adsorption / desorption

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Description of key information

log Koc > 4 (KOCWIN 2.00)

Key value for chemical safety assessment

Additional information

No experimental data is available on the adsorption/desorption behaviour of UMA 121. The smallest constituent HPMA is soluble in water and has a low log Kow value of 0.72 (KOWWIN v1.68), indicating low adsorption potential. For the UMA homologues the assessment of adsorption potential was based on QSAR calculations conducted with KOCWIN v2.00. Calculations were performed for the two smallest homologues n=0 and n=1. Based on molecular weight and log Kow, only the n=0 homologue fits into the range of the training set of the models used. With the log Kow based estimation log Koc values of 4.04 and 6.02 were obtained for the n=0 and n=1 homologues, respectively. Using the molecular connectivity index (MCI) the corresponding values were 4.64 and 10.8. All values indicate high adsorption potential. The larger homologues (n>1) are expected to have even higher adsorption potential. Therefore, it can be concluded that UMA homologues have potential to adsorb to solid organic matter.