Registration Dossier
Registration Dossier
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EC number: 221-659-2 | CAS number: 3179-63-3
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption to the solid soil phase is not expected under environmentally relevant conditions. Moreover, the substance is readily biodegradable according to OECD criteria.
Key value for chemical safety assessment
- Koc at 20 °C:
- 40
Additional information
QSAR-Disclaimer
In Article 13 of Regulation (EC) No 1907/2006, it is laid down that information on intrinsic properties of substances may be generated by means other than tests, provided that the conditions set out in Annex XI (of the same Regulation) are met. Furthermore according to Article 25 of the same Regulation testing on vertebrate animals shall be undertaken only as a last resort.
The adsorption potential was estimated for 3-dimethylaminopropan-1-ol (CAS 3179 -63 -3) using the MCI and the Kow methods of the KOCWIN v2.00 module from SRC EPI Suite v4.11. These estimates are representative for uncharged molecules. The substance ionises in aqueous solutions, therefore the adsorption coefficient was calculated according to Franco & Trapp (2008, 2009, 2010) to correct for the charged molecule at pH 5,7,8. The model is not yet validated; in addition, the applicability domain is not clearly defined. Nevertheless, the Koc values of the Franco & Trapp method give a good indication on the adsorption potential of a substance depending on the pH conditions of soil. The method is based on the dissociation constant pKa and the log Kow for the uncharged molecule. The Koc values are listed below.
Uncharged molecule:
- MCI method: Koc = 2.23; log Koc = 0.35
- Kow method: Koc = 0.104; log Koc = -0.98
Charged molecule:
- Franco & Trapp, 2008, 2009, 2010:
pH 5-8: Koc = 40; log Koc = 1.60
Adsorption to the solid soil phase is not expected. Moreover, the substance is readily biodegradable.
[LogKoc: 1.6]
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