Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
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]
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