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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

pKa1=1.7, pKa2=3.5 and pKa3=11.1 at 20 °C

Key value for chemical safety assessment

Additional information

In the key study (BASF SE, 2001), the dissociation constants of the test substance were determined by the spectrophotometric method at 20 °C according to OECD guideline 112. The dissociation constants of the test substance were pKa1=1.7, pKa2=3.5 and pKa3=11.1.

In the supporting study (American Cyanamid, 1985), the test substance showed a dissociation constant of 3.8.

Furthermore, comparable dissociation constants were listed in the HSDB database with values of pKa1=1.9, pKa2=3.6 and pKa3=11.