Registration Dossier
Registration Dossier
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EC number: 205-411-0 | CAS number: 140-31-8
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
An estimated Koc of 37,000 L/kg is derived for aminoethylpiperazine, based on measured Koc values for structural analogs (ethylenediamine and diethylenetriamine).
Key value for chemical safety assessment
Additional information
AEP possesses primary, secondary, and tertiary amino groups having acid dissociation constants (pKa) of 9.6, 8.5, and 4.3. Therefore, the substance will occur in a fully, and multiply-charged (protonated) state under the pH conditions typically encountered in the environment. Although such aliphatic polyamines have low log Kow and high water solubility, they exhibit strong affinity for soil and sediment particles via a cation-exchange mechanism. Although this mechanism is not highly correlated with organic carbon content of soil or sediment, mean Koc values of 4,766 L/kg and 37,000 L/kg were measured for analogous ethyleneamines (ethylenediamine, and diethylenetriamine, respectively) in a wide range of soil types. AEP possesses primary, secondary, and tertiary amino groups having acid dissociation constants (pKa) of 9.6, 8.5, and 4.3. Therefore, the substance will occur in a fully, and multiply-charged (protonated) state under the pH conditions typically encountered in the environment. Although such aliphatic polyamines have low log Kow and high water solubility, they exhibit strong affinity for soil and sediment particles via a cation-exchange mechanism. Although this mechanism is not highly correlated with organic carbon content of soil or sediment, mean Koc values of 4,766 L/kg and 37,000 L/kg were measured for analogous ethyleneamines (ethylenediamine, and diethylenetriamine, respectively) in a wide range of soil types. An estimated Koc value of 37,000 was derived for AEP, based on correlation of these measured Koc values with log Kow.
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