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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Physical & Chemical properties

Dissociation constant

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Administrative data

Link to relevant study record(s)

Description of key information

Diethylenetriamine exhibits three dissociation constants, which were determined to be pKa1 = 4.889, pKa2 = 9.386, pKa3 = 10.101 at 25 °C in 3M KNO3 electrolyte. 

Key value for chemical safety assessment

Additional information

The measured pKa values indicate that diethylenetriamine will exist in a protonated state at the ~pH 7 conditions occurring in the environment and/or in biological media. Therefore, the partitioning/distribution of the substance may not be accurately derived on the basis of log Kow alone.