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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Description of key information

The estimated log Koc values for homologous components of this UVCB substance 
range from 22 to 14430 L/kg for the lowest (least sorptive) and
highest (most sorptive) molecular weight homologues.
The components of this UVCB substance can be regarded as having low affinity
for adsorption to soils and activated sludge biosolids.

Key value for chemical safety assessment

Koc at 20 °C:
14 430

Additional information

The KOCWIN software is shown to produce estimated log Koc values which are typically within 0.3 log units of measured values for a set of amine- and alcohol-bearing substances which are expected to have log Koc values bracketing that of the test substance. Because the software training set includes measured Koc values for several aliphatic and aromatic amine substances, it is expected to provide accurate predictions of adsorption for amine-initiated NLP polyols, which may adsorb to soil by a combination of cation-exchange and hydrophobic partitioning mechanisms. These results are therefore expected to provide a more realistic estimation of adsorption potential than the HPLC estimation method, which may be confounded by the surface-activity of the test substance components and lack of relevant reference substances (i.e., alcohols, ethers, amines) employed in the OECD 121 guideline.

Adsorption/Desorption was investigated using the OECD 121 method, and results indicated Log Koc 2.64 to 3.42 over the pH range of 3 to 9. Because the HPLC method does not account for the cation-exchange mode of adsorption, it may not correctly predict the adsorption of the test substance components which posses cationic amino groups.

[LogKoc: 4.16]