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Partition coefficient

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Reference
Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2021-09-21
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 117 (Partition Coefficient (n-octanol / water), HPLC Method)
Deviations:
yes
Remarks:
Due to technical reasons, standards were injected separately instead of simultaneously.
Qualifier:
according to guideline
Guideline:
other: Coucil Regulation (EC) No. 266/2016 Method A.24
Deviations:
yes
Remarks:
Due to technical reasons, standards were injected separately instead of simultaneously.
GLP compliance:
yes (incl. QA statement)
Type of method:
HPLC method
Partition coefficient type:
octanol-water
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source (i.e. manufacturer or supplier) and lot/batch number of test material: Colorants Solutions Deutschland GmbH; batch number DEB2125417 (Mi 3033)
- Purity, including information on contaminants, isomers, etc.: 76.9% w/w

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: 18 - 25 °C, dark, in tightly closed original container
- Stability and homogeneity of the test material in the vehicle/solvent under test conditions (e.g. in the exposure medium) and during storage: stable
- Stability in the medium, i.e. sensitivity of the test material to hydrolysis and/or photolysis: 24 hours in DMSO, >72 hours in 1,2-propylene glycol at room temperature
- Solubility and stability of the test material in the solvent/vehicle and the exposure medium: not specified
- Reactivity of the test material with the incubation material used (e.g. plastic ware): not specified

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing (e.g. warming, grinding): none
- Final concentration of a dissolved solid, stock liquid or gel: Stock solution of 100mg/L in acetonitrile, dissolution was facilitated by ultra-sonic treatment at ambient temperature for 5 min; dulited with ultrapure water and acetonitrile to 20 mg/L in acetonitrile : water (65 : 35)
- Final preparation of a solid (e.g. stock crystals ground to fine powder using a mortar and pestle): none
Analytical method:
high-performance liquid chromatography
Key result
Type:
log Pow
Partition coefficient:
4.83
Temp.:
22.6 °C
pH:
0
Remarks on result:
other:
Remarks:
No pH value was measured for the mobile phase, because the a.i. is a neutral component. Furthermore, the test item is not expected to influence the pH value of the mobile phase.

Description of key information

The log Pow of the test substance was estimated according to the OECD guideline 117. The log Pow at 22.6 °C was 4.83.

Key value for chemical safety assessment

Log Kow (Log Pow):
4.83
at the temperature of:
22.6 °C

Additional information