Registration Dossier
Registration Dossier
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EC number: 205-196-3 | CAS number: 135-51-3
pH
Administrative data
- Endpoint:
- pH
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 5 March 2018
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study without detailed documentation
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 018
- Report date:
- 2018
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 122 (Determination of pH, Acidity and Alkalinity)
- GLP compliance:
- no
Test material
- Reference substance name:
- Disodium 3-hydroxynaphthalene-2,7-disulphonate
- EC Number:
- 205-196-3
- EC Name:
- Disodium 3-hydroxynaphthalene-2,7-disulphonate
- Cas Number:
- 135-51-3
- Molecular formula:
- C10H8O7S2.2Na
- IUPAC Name:
- disodium 3-hydroxynaphthalene-2,7-disulphonate
- Test material form:
- solid
- Details on test material:
- Identity: 3-Hydroxynaphthalene-2,7-disulfonic acid disodium salt
Appearance: powder/grey
Constituent 1
- Specific details on test material used for the study:
- Name: 3-Hydroxynaphthalene-2,7-disulfonic acid disodium salt
Appearance Powder/grey
Reagents
- Reagent:
- buffer solutions
Titration of acidity and alkalinity
- Details on titrant used:
- The pH-electrode was calibrated with commercial available buffer solutions (Certipur, Merck at pH 4, 7 and 9) before.
Results and discussion
pH value
- Key result
- pH value:
- 1.8
- Temp.:
- 25 °C
- Concentration:
- 10 vol%
Any other information on results incl. tables
The pH was measured to be 1.8 in 10% solution in water (3 repetitions) at 25 C°.
Applicant's summary and conclusion
- Conclusions:
- The pH of 3-Hydroxynaphthalene- 2,7-disulfonic acid disodium salt at 10% in water is 1.8 (according to OECD 122 and DIN 19268:2007-05).
- Executive summary:
The pH of 3-Hydroxynaphthalene- 2,7-disulfonic acid disodium salt at 10% in water is 1.8 (according to OECD 122 and DIN 19268:2007-05).
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