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EC number: 227-563-7 | CAS number: 5888-87-9
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data

Dissociation constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2009
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 112 (Dissociation Constants in Water)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Dissociating properties:
- no
- Remarks on result:
- other: The test item shows virtually no dissociation.
- Conclusions:
- No measurable dissociation in aqueous solutions, therefore the determination of the dissociation constant is not possible.
- Executive summary:
No measurable dissociation in aqueous solution.
Reference
Three different approaches were made. A determination of the dissociation constant wasn't possible as the test item shows virtually no dissociation.
When using the volumetric method, a test item concentration above 100 mg/L should be used , as weaker solutions show only small changes in pH. The test item isn't sufficiently soluble in water. Solubility was determined in study 07120704G910 with 49 mg/L. Larger concentrations didn't dissolve, even when adding HCL or NaOH. Therefore, this method could not be used.
For testing the applicability of the conductometric method, a saturated solution of the test item was prepared and its conductivity was measured. The saturated solution showed a conductivity of 1.7 µS/cm, lower concentrations gave no dose-response-relation, and the
absolute values were very small. Therefore, the conductometric method could not be used, either.
Then, the photometric method was applied. No significant differences in the spectra of six test item solutions with different pHs could be found. Therefore, the photometric method didn't yield results, either.
As the test item N,N'-hexane-1,6-diylbis(hexahydro-2-oxo-1 H-azepine-1-carboxamide) shows virtually no measurable dissociation in aqueous solutions, determination of the dissociation constant is not possible.
Description of key information
The test item shows virtually no dissociation.
Key value for chemical safety assessment
Additional information
As the test item N,N'-hexane-1,6-diylbis(hexahydro-2-oxo-1 H-azepine-1-carboxamide)
shows virtually no measurable dissociation in aqueous solutions, determination of the dissociation
constant is not possible.
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