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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Additional information

[LogKoc: -1.32]