Registration Dossier

Administrative data

Endpoint:
pH
Type of information:
experimental study
Adequacy of study:
key study
Study period:
28/04/2009 to 05/08/2009
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The measurements were conducted according to CIPAC methods, and under GLP. However, restrictions are proposed because calibration results are not provided.
Cross-referenceopen allclose all
Reason / purpose:
reference to same study
Reason / purpose:
reference to other study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009
Report Date:
2009

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
other: CIPAC MT 75.3 (pH)
Qualifier:
according to
Guideline:
other: CIPAC MT 191 (acidity/alkalinity)
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent

Results and discussion

pH value
pH value:
12.4
Temp.:
21 °C
Concentration:
ca. 10 g/L
Remarks on result:
other: saturated solution

Any other information on results incl. tables

pH Value

pH value of Test Item in saturated aqueous solution (about 10 g/L)

Sample ID

Equilibration Time [min]

pH

Temperature [°C]

Mean pH

P7

1

12.39

20.7

12.41

P8

1

12.42

20.8

Alkalinity

Titer of 0.1 M Hydrochloric Acid

Sample ID

Weight of sodium carbonate [mg]

Theoretical consumption [mL]

Experimental consumption [mL]

Titer

Mean Titer

1

78.51

14.815

14.035

1.0555

1.0572

2

84.3

15.907

15.030

1.0584

3

75.84

14.311

13.529

1.0578

Alkalinity expressed as NaOH [% w/w] (concentration of test solution: 3.7 g/L)

Sample ID

Weight of test item [mg]

Consumption of HCl [mL]

Concentration of HCl [mol/L]

Titer

Alkalinity [%w/w]

Mean Alkalinity [%w/w]

1

0.37893

12.266

0.1

1.0572

13.6925

13.5997

2

0.38923

12.542

13.6301

3

0.37433

11.926

13.4765

Applicant's summary and conclusion

Conclusions:
pH = 12.4 (saturated solution at 21°C)
Alkalinity = 13.6 %w/w NaOH (at 25°C)
This data can be relevant for classification regarding corrosive properties.
Executive summary:

The pH of a saturated solution (10 g/L) of the test substance in deionised water was measured according to CIPAC MT75.3 guideline, using a pH-meter and a glass electrode, under GLP. As the result was above 10, the free alkalinity was also determined, according to CIPAC MT191 guideline, on a dilute solution (3.7 g/L).