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Registration Dossier
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EC number: 221-490-4 | CAS number: 3118-97-6
pH
Administrative data
- Endpoint:
- pH
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 17-08-2017 – 17-08-2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Justification for type of information:
- Experimental test result performed using standard test guidelines
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 017
- Report date:
- 2017
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 122 (Determination of pH, Acidity and Alkalinity)
- Principles of method if other than guideline:
- A pH meter is essentially a voltmeter with high input impedance which measures the voltage of an electrode sensitive to the hydrogen ion concentration, relative to another electrode which exhibits a constant voltage
- GLP compliance:
- no
Test material
- Reference substance name:
- 1-(2,4-dimethylphenylazo)-2-naphthol
- EC Number:
- 221-490-4
- EC Name:
- 1-(2,4-dimethylphenylazo)-2-naphthol
- Cas Number:
- 3118-97-6
- Molecular formula:
- C18H16N2O
- IUPAC Name:
- 1-(2,4-dimethylphenylazo)-2-naphthol
- Test material form:
- solid: crystalline
- Details on test material:
- - Name of test material : C.I. Solvent Orange 7
- Molecular formula : C18H16NO
- Molecular weight : 276.3374 g/mol
- Smiles notation : Cc1ccc(N=Nc2c(O)ccc3ccccc23)c(C)c1
- InChl : 1S/C18H16N2O/c1-12-7-9-16(13(2)11-12)19-20-18-15-6-4-3-5-14(15)8-10-17(18)21/h3-11,21H,1-2H3/b20-19+
- Substance type:Organic
- Physical appearance : Solid
Constituent 1
Results and discussion
pH value
- Key result
- pH value:
- 6.69
- Temp.:
- 26.1 °C
- Concentration:
- 1 vol%
Any other information on results incl. tables
Method Details |
Observations |
Remarks if, any |
|
Guideline |
OECD 122 |
- |
- |
Method |
Digital pH meter |
- |
|
Principle of method
|
The mean pH of an aqueous solution or dispersion in water is determined with a pH measurement interface equipped with an appropriate electrode system. |
- |
|
Temperature of 1% w/v test dispersion |
- |
26.1°C |
|
mean pH (RESULT) |
- |
6.69 |
|
Inference |
1. Acidic 2. Basic 3. Neutral |
Neutral |
|
Applicant's summary and conclusion
- Conclusions:
- The pH determination of test item 1-(2,4-dimethylphenylazo)-2-naphthol (CAS No. 3118-97-6) was done as per the test guideline OECD 122. The mean pH of the test dispersion was determined with the help of digital pH meter. The mean pH was found to be 6.69 at 26.1 °C.
- Executive summary:
The pH determination of test item 1-(2,4-dimethylphenylazo)-2-naphthol (CAS No. 3118-97-6) was done as per the test guideline OECD 122. The mean pH of the test dispersion was determined with the help of digital pH meter. The mean pH was found to be 6.69 at 26.1 °C.
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