Registration Dossier
Registration Dossier
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EC number: 256-458-9 | CAS number: 49744-28-7
Solubility in organic solvents / fat solubility
Administrative data
- Endpoint:
- solubility in organic solvents / fat solubility
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- 2010
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Test procedure according to method of Analytical Expert Group ETAD (Ecological and Toxicological Association of Dyes and Organic Pigment Manufacturer)
Cross-reference
- Reason / purpose for cross-reference:
- reference to same study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 010
- Report date:
- 2010
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- other: Analytical Expert Group ETAD
- Principles of method if other than guideline:
- About 5 mg of the test sample were suspended in 30 mL octanol (Aldrich, spectrophotometric grade) in a sample flask (standard flask for the Büchi Rack R-24, volume 30 mL) and were shaken for two hours at 30°C (+/- 2°C) on a "Büchi Syncore Polyvap" with 400 rpm. Then shaking was continued at ambient temperature (22 - 23°C) for 70 hours, followed by filtration 3 times through a 0.2 µm membrane filter.
The resulting clear solution was measured by UV-vis spectrometry and the absorption was determined at 520 nm. The determination was repeated three times.
Calibration for determination of concentration of the samples applying the Lambert-Beer rule: calibration curve of 1-((4-methoxy-2-nitrophenyl)azo)-2-naphthol in chloroform.
Test material
- Reference substance name:
- 1-[(4-methoxy-2-nitrophenyl)azo]-2-naphthol
- EC Number:
- 256-458-9
- EC Name:
- 1-[(4-methoxy-2-nitrophenyl)azo]-2-naphthol
- Cas Number:
- 49744-28-7
- Molecular formula:
- C17H13N3O4
- IUPAC Name:
- 1-[(4-methoxy-2-nitrophenyl)diazenyl]-2-naphthol
- Test material form:
- solid
Constituent 1
Results and discussion
Solubility in organic solvents / fat solubility
- Medium:
- n-octanol
- Solubility:
- <= 72 mg/L
- Temp.:
- 22 °C
- Remarks on result:
- other: mean of 3 measurements
- Test substance stable:
- yes
Any other information on results incl. tables
The solubility of the sample 1 -((4 -methoxy-2 -nitrophenyl)azo)-2 -naphthol in n-octanol at ambient temperature, determined under the conditions as mentioned above, is 72 mg/L (mean, n = 3,sigma= 0.4).
Table 1: Individual results
| Absorption (d = 10 cm) | mg/L | |
| a1 | 1.0757 | 71.6 |
| a2 | 1.0841 | 72.2 |
| a3 | 1.0865 | 72.3 |
Applicant's summary and conclusion
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