Registration Dossier
Registration Dossier
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EC number: 250-792-9 | CAS number: 31765-95-4
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:
- 2016
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.8 (Partition Coefficient - Shake Flask Method)
- Version / remarks:
- Published in Official Journal of the European Union No. L 142, May 30, 2008
- Deviations:
- not specified
- GLP compliance:
- no
- Type of method:
- other: shake-flask method with adjustment results
- Partition coefficient type:
- octanol-water
- Specific details on test material used for the study:
- Name: Saturn Grey LCGCAS: 31765-95-4Batch No.: 8010/2008Appearance: black powderStorage: dark dry room, closed container, at laboratory temperatureExpiration date: February 2018
- Analytical method:
- photometric method
- Key result
- Type:
- log Pow
- Partition coefficient:
- < -2
- Remarks on result:
- other: temperature and pH not reported
- Conclusions:
- Educated guess of Partition coefficient (log Pow) of the test substance, Direct Black 112, is: log Pow is lower than -2.0.
- Executive summary:
In previous study for the determination of Pow the concentrations of test substance in octanol phases were calculated as difference from the original concentrations and the amount determined in the aqueous phases due to low solubility of Direct Black 112 in octanol.
Based on the new findings from other studies of similar substances, it was considered that the procedure used for determination of the partition coefficient mentioned above was not appropriate and could give unreliable results.
Alternatively the partition coefficient could be estimated on the base of the water solubility and on the base of solubility in octanol.
The test substance is practically insoluble in n-octanol. Solubility of test substance in saturated n-octanol is under the limit.
Thus the determination of partition coefficient n-octanol/water cannot be performed due to character of the test substance, Direct Black 112.
Based on this information the following Expert Statement is issued instead:
Educated guess of Partition coefficient (log Pow) of the test substance, Direct Black 112, is lower than -2.0.
Reference
Description of key information
Educated guess of Partition coefficient (log Pow) of the test substance, Direct Black 112, is: log Pow is lower than -2.0.
Key value for chemical safety assessment
- Log Kow (Log Pow):
- -2
Additional information
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