Registration Dossier
Registration Dossier
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EC number: 235-471-3 | CAS number: 12238-31-2 This substance is identified in the Colour Index by Colour Index Constitution Number, C.I. 15860:2.
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:
- 2009
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study with acceptable restrictions
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- other: ETAD guideline ETAD-229
- Deviations:
- no
- Principles of method if other than guideline:
- A defined amount of the pigment was transferred to a 100 mL flask with glass stopper and 60 mL of water (deionised, 18.2 MOcm). This was stirred at 70°C for 2 hours and then 72 hours in an air conditioned laboratory (T = 23°C).
The suspension was then centrifuged (10000 rpm, 10 minutes) and filtered once through a standard paper filter, twice through a 0.2 micrometer membrane filter (Millipore) and twice through a 0.025 micrometer filter (Millipore) until a perfectly clear solution was achieved. This procedure was conducted in parallel for a total of 2 water samples and of 2 n-octanol samples. - GLP compliance:
- no
- Type of method:
- estimation method (solubility ratio)
- Partition coefficient type:
- octanol-water
- Specific details on test material used for the study:
- - Substance type: Organic
- Physical state: Solid (powder)
- Lot/batch No.: HW-08-012
- Expiration date of the lot/batch: January 01, 2017
- Name of test material (as cited in study report): PIGMENT RED 52:2, TKP 50134
- Analytical purity: not available - Analytical method:
- other: UV/Vis
- Key result
- Type:
- log Pow
- Partition coefficient:
- -0.3
- Temp.:
- 23 °C
- Remarks on result:
- other: pH not determined
- Details on results:
- Average concentrations in water: 17.4 mg/L
Average concentration in n-octanol: 8.7 mg/L - Conclusions:
- The partition coefficient of test substance was estimated to be log Pow = -0.30 at 23°C
Reference
Description of key information
Estimated based on solubility ratio:
log Pow = -0.30 at 23°C
Key value for chemical safety assessment
- Log Kow (Log Pow):
- -0.3
- at the temperature of:
- 23 °C
Additional information
The partition coefficient was estimated based on the ratio of the solubilities in n-octanol and in water.
The individual solubilities were determined by flask method based on OECD Guideline 105 and the ETAD method. The quantification was analyzed by UV/Vis absorption.
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