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Physical & Chemical properties

Partition coefficient

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Reference
Endpoint:
partition coefficient
Type of information:
calculation (if not (Q)SAR)
Remarks:
educated guess
Adequacy of study:
key study
Study period:
2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: educated guess
Qualifier:
no guideline required
Principles of method if other than guideline:
Thus the determination of partition coefficient n-octanol/water cannot be performed due to character of the test substance, Direct Blue 78.
GLP compliance:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Partition coefficient type:
octanol-water
Key result
Type:
log Pow
Partition coefficient:
-2
Remarks on result:
not determinable
Remarks:
The test substance is poorly soluble in n-octanol. Solubility of test substance in saturated n-octanol is under the limit of quantification – LOQ = 1.0 mg/L. Thus the determination of partition coefficient n-octanol/water cannot be performed due to character of the test substance
Details on results:
Based on this information the study was not performed and the following Expert Statement is issued instead:Educated guess of partition coefficient (log Pow) of the test substance, Direct Blue 78 , is lower than -2.0 . Educated guess of partition coefficient (log Pow) of the test substance is based on knowledge and experience from previous studies of similar substances.
Conclusions:
Educated guess of Partition coefficient (log Pow) of the test substance, Direct Blue 78, is: log Pow is lower than -2.0
Executive summary:

The test substance is poorly soluble in n-octanol. Solubility of test substance in saturated n-octanol is under the limit of quantification – LOQ = 1.0 mg/L.

Thus the determination of partition coefficient n-octanol/water cannot be performed due to character of the test substance, Direct Blue 78. 

Based on this information the following Expert Statement is issued instead:

Educated guess of Partition coefficient (log Pow) of the test substance Direct Blue 78 is lower than -2.0 .

Description of key information

Thus the determination of partition coefficient n-octanol/water cannot be performed due to character of the test substance, Direct Blue 78.

Educated guess of partition coefficient (log Pow) of the test substance is based on knowledge and experience from previous studies ofsimilar substances. 

Educated guess of Partition coefficient (log Pow) of the test substance, Direct Blue 78, is: log Pow is lower than -2.0

Klimish score 1.

     

Key value for chemical safety assessment

Log Kow (Log Pow):
-1

Additional information

The value Log Koe -1 was used as a key value for exposure scenarios in CHESAR.