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Physical & Chemical properties

Dissociation constant

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Description of key information

The dissociation constant of the substance was calculated from the structure of the main component following Perrin's calculation method. This GLP study revealed a pKa of 9.9 and 9.3 for both the R-NH3+ groups (Baltussen, 2004).

Key value for chemical safety assessment

Additional information

For complex mixtures (e.g. UVCBs) containing ionisable components the assessment of pKa is clearly complicated. Estimation of the pKa values of the main component is therefore considered as an alternative.

In addition to the pKa values for the R-NH3+ groups, pKa values were calculated for the R-O-R groups to be -4.7 and -5.3.