Registration Dossier
Registration Dossier
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EC number: 938-649-5 | CAS number: 1469982-92-0
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
The pKa values for the test substance are 10.02, 9.21 and 4.42 at 25ºC.
Key value for chemical safety assessment
Additional information
Result are based on read-across to a substance with the same dissociating part of the molecule as for the substance registered. It is assumed that length of the hydrophobe has no significant effect on the pKa value. The pKa values for the test substance are 10.02, 9.21 and 4.42 at 25ºC from the read across study. Furthermore, the pKa is not strongly temperature dependent.
Based on these results it can be presumed that the substance would be ionised at environmentally relevant pH's.
Discussion on Read-Across:
This literature search was performed to evaluate dissociation constant data for Tall oil diethylenetriamine imidazoline, which is assessed to be a suitable read-across substance to Fatty acids, C18 unsaturated, reaction products with diethylenetriamine, acetate salts.
The dissociating part of the molecule assessed was the same as the registered substance (Tall oil diethylenetriamine imidazoline). It is assumed that length of the hydrophobe has no significant effect on the pKa values. The neutralisation of the Tall oil diethylenetriamine with actetic acid, which forms the acetate salts form of the substance, does not impact on the main dissociating part of the molecule assessed, nor the length of the hydrophobic chains. The neutralisation and presence of acetate salts groups is therefore not anticipated to significantly effect the dissociation properties of the substance and the pKa values, and there it can be presumed that
Fatty acids, C18 unsaturated, reaction products with diethylenetriamine, acetate salts, would be ionised at environmentally relevant pH's.
It is therefore considered that the results obtained from the literature search to assess Tall oil diethylenetriamine imidazoline are suitable foruse in the evaluation of Fatty acids, C18 unsaturated, reaction products with diethylenetriamine, acetate salts.
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