Registration Dossier
Registration Dossier
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EC number: 439-590-3 | CAS number: 12158-75-7
Dissociation constant
Administrative data
- Endpoint:
- dissociation constant
- Rationale for reliability incl. deficiencies:
- other: Already evaluated by the Competent Authorities for Biocides and Existing Substance Regulations for other copper compounds
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
Data source
Materials and methods
Results and discussion
Applicant's summary and conclusion
- Conclusions:
- Dissociation is a reversible equilibrium process where a species exists either in an ionised or an unionised solution state. The dissociation constant (pKa) is effectively the ratio of the associated (unionised) to dissociated (ionised) substance in solution. Copper is a poorly soluble metallic element that can only remain in solution in a totally dissociated ionic state: a non reversible process. Since its solubility is low and it does not exist in solution in an associated state, it does not therefore have a measurable dissociation constant.
- Executive summary:
Dissociation is a reversible equilibrium process where a species exists either in an ionised or an unionised solution state. The dissociation constant (pKa) is effectively the ratio of the associated (unionised) to dissociated (ionised) substance in solution. Copper is a poorly soluble metallic element that can only remain in solution in a totally dissociated ionic state: a non reversible process. Since its solubility is low and it does not exist in solution in an associated state, it does not therefore have a measurable dissociation constant.
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