Registration Dossier
Registration Dossier
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EC number: 204-671-2 | CAS number: 124-02-7
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The substance is an amine with a dissociation constant of 9.29, meaning that it would be essentially ionized throughout the environmentally relevant pH range (pH 5.5 to 7.5).
Therefore, it is anticipated that adsorption to the organic carbon content of soils and sediments will not be the dominant mechanism controlling the mobility of the test item in the environment. Adsorption of cationic species occurs primarily by an ion-exchange mechanism and thus depends on the cation-exchange capacity of the sorbent as well as a variety of other parameters. Consequently, the true adsorption coefficient of the test item will be significantly higher than any Koc values determined by the EC C19 / OECD 121 method and via any computer-based Koc estimation software.
To estimate an adsorption coefficient a calculation has been used according to a publication by Franco & Trapp, 2008. This calculation model is designed for ionizable organic chemicals and the parameters used in the calculation were pKa 9.29 and log Kow 1.11 (for the substance in its unionized form). The calculated log Koc is 2.91.
It is considered appropriate to use this calculation method rather than a computer-based Koc estimation software (Epiwin program Kocwin), as this model may underestimate adsorption to organic carbon since it does not consider the ionic structure of the molecule.
Key value for chemical safety assessment
- Koc at 20 °C:
- 804.6
Additional information
[LogKoc: 2.91]
[LogKoc: 2.91]
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