Registration Dossier
Registration Dossier
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EC number: 700-579-6 | CAS number: -
Partition coefficient
Administrative data
Link to relevant study record(s)
- Endpoint:
- partition coefficient
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2010
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Qualifier:
- according to guideline
- Guideline:
- other: Guidance on information requirements and chemical safety assessment Chapter R.7a: Endpoint specific guidance
- Principles of method if other than guideline:
- - Principle of test: the log Kow was calculated based on the solubility of the substance in octanol and in water.
- GLP compliance:
- no
- Type of method:
- estimation method (solubility ratio)
- Partition coefficient type:
- octanol-water
- Specific details on test material used for the study:
- - Batch N° 900501
- Analytical method:
- photometric method
- Key result
- Type:
- log Pow
- Partition coefficient:
- > 7.54
- Temp.:
- 22 °C
- Remarks on result:
- other: pH not determined
- Conclusions:
- The solubilities of the test item in octanol and in water were measured separately and then compared to each other (as advised in the R7a ECHA REACH Guideline) . The extrapolated log Kow value for Sepisol fast Blue 85219 was calculated to be 7.54.
Reference
Solubility in octanol: 260 g/L
The solubility in water was zero, therefore the log Kow tends to the infinity. However, based on the limit of detection of the method used to determine the solubility in water a worst case concentration of 0.0075 mg/l is calculated.
log P = log (conc in oct / conc in water) = 7.54 and tends to the infinity
Description of key information
The estimation of the log Kow is based on the ratio of the solubility of the substance in octanol and in water separately. The log Kow value was calculated to be between 7.54 and the infinity. Indeed, the hydrosolubility tends toward 0.
Therefore, the calculated log Kow value is not accurate and uncertain, but in a worst case scenario, a minimal value of 7.54 is selected
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 7.54
- at the temperature of:
- 22 °C
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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