Registration Dossier
Registration Dossier
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EC number: 814-283-0 | CAS number: 42220-47-3
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The test item Phosphonic acid, P,P'-(1-hydroxyethylidene)bis-, compd. with 2-aminoethanol is an UVCB substance. The substructures etidronic acid forms with the triethanolamine a salt like structures, which in the aquatic milieu of the environment are expected to dissociate into etidronic acid and ethanolamine.
Therefore, for etidronic acid CAS: 2809-21-4 and ethanolamine CAS: 141-43-5 KOC values were determined:
etidronic acid : log KOC -1.32 (QSAR modelling KOCwin v. 2.00)
ethanolamine: log KOC -0.23 (QSAR modelling KOCwin v. 2.00), a similar value in a comparable range is also available from a REACH dossier for ethanolamine with log KOC -0.78.
The log KOC value of etidronic acid was further used to derive by EPM method the PNEC values for soil and sediment organisms. Etidronic acid (CAS: 2809-21-4) is not readily biodegradable, and therefore is expected to be more relevant for the environment than ethanolamine, which is readily biodegradable.
Key value for chemical safety assessment
- Koc at 20 °C:
- 0.048
Additional information
[LogKoc: -1.32]
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