Registration Dossier
Registration Dossier
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EC number: 430-500-8 | CAS number: 204277-61-2
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
The purpose of this study was to estimate the dissociation constants (pKa-values) of FAT41024/B.
The dissociation of a chemical in water is of importance in assessing its impact upon the environment. It governs the form of the substance, which in turn determines its behaviour and transport. It may affect the adsorption of the chemical on soils and adsorption into biological cells.
Key value for chemical safety assessment
Additional information
The molecular structure of FAT 41'024/B was used for the estimation of the dissociation behaviour. The compound has several sites which can be protonated.
- Diazogroup: pKa < 0 (General estimation)*
- Amide: pKa>= 17 (Taft)
- Tertiary Aminium ion: pKa = 0.6 (Taft)
* It is not possible to estimate an exact value for the diazogroup, however, protonated azobenzenes are strong acids and therefore, the azo-group is normally not protonated in aqueous solutions.
Conclusion:
FAT 41'024/B is not dissociated or protonated in the environmentally relevant pH range.
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