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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
pH
Type of information:
experimental study
Adequacy of study:
key study
Study period:
12 April 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:
2018
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

Constituent 1
Chemical structure
Reference substance name:
5-aminonaphthalene-1-sulphonic acid
EC Number:
201-571-0
EC Name:
5-aminonaphthalene-1-sulphonic acid
Cas Number:
84-89-9
Molecular formula:
C10H9NO3S
IUPAC Name:
5-aminonaphthalene-1-sulphonic acid
Test material form:
solid
Details on test material:
Identity: 5-Amino-1- naphthalenesulfonic acid
Appearance: powder/violet
Specific details on test material used for the study:
Name: 5-Amino-1-naphthalenesulfonic acid
Appearance Powder/violet

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:
4.1
Temp.:
25 °C
Concentration:
1 vol%

Any other information on results incl. tables

The pH was measured to be 4.1 in 1% solution in water (3 repetitions) at 25 C°.

Applicant's summary and conclusion

Conclusions:
The pH of 5-Amino-1-naphthalenesulfonic acid at 1% in water is 4.1 (according to OECD 122 and DIN 19268:2007-05).
Executive summary:

The pH of 5-Amino-1-naphthalenesulfonic acid at 1% in water is 4.1

(according to OECD 122 and DIN 19268:2007-05).