Registration Dossier
Registration Dossier
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EC number: 224-924-0 | CAS number: 4553-89-3
pH
Administrative data
- Endpoint:
- pH
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 19/10/2015 - 19/10/2015
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Justification for type of information:
- Experimental test result performed using standard OECD test guidelines
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 015
- Report date:
- 2015
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- other: OECD 122
- 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:
- Disodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate
- EC Number:
- 224-924-0
- EC Name:
- Disodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate
- Cas Number:
- 4553-89-3
- Molecular formula:
- C27H20N4O9S2.2Na
- IUPAC Name:
- disodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate
- Test material form:
- solid: particulate/powder
- Details on test material:
- - Name of test material (as cited in study report): Disodium 4,4’-(2,4-dihydroxy-5- hydroxymethyl-1,3-phenylene bis-azo) di- (naphthalene-1-sulfonate)
- Molecular formula: C27H20N4O9S2.2Na
- Molecular weight: 654.58 g/mol
- Substance type: Organic
- Physical state: Solid
Constituent 1
Results and discussion
pH value
- Key result
- pH value:
- 4.5
- Temp.:
- 24.9 °C
- Concentration:
- 1 vol%
Applicant's summary and conclusion
- Conclusions:
- pH of 1% w/v aqueous solution of the test item disodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate (CAS No. 4553-89-3) is determined to be 4.5 at 24.9°C.
- Executive summary:
pH of 1% w/v aqueous solution of the test item disodium 4,4'-[[2,4-dihydroxy-5-(hydroxymethyl)-1,3-phenylene]bis(azo)]bisnaphthalene-1-sulphonate (CAS No. 4553-89-3) is determined to be 4.5 at 24.9°C. Thus, 1% solution can be considered to be slightly acidic in nature.
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