Hydrogen peroxide

pH

Administrative data

Endpoint:

pH

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Study compliant to guidelines and according to GLP.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2007

Report date:

2007

Materials and methods

Principles of method if other than guideline:

The measurement of the pH value of the undiluted test item was carried out according to the specifications given in CIPAC Method MT 75.3 (according to CEFIC PEROXYGENS H2O2 AM-7160).

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

Hydrogen peroxide

EC Number:

231-765-0

EC Name:

Hydrogen peroxide

Cas Number:

7722-84-1

Molecular formula:

H2O2

IUPAC Name:

hydrogen peroxide

Details on test material:

Identity: Hydrogen peroxide Peroxal 50DS
Batch: 07-0115-9682007
Content of a.i.: 49.60 % (m/m) by mass
Appearance: Liquid, colourless
Expiration date: January 26, 2008
Storage: At room temperature at about 20°C

Results and discussion

pH value

pH value 1

pH value:

2

Temp.:

21 °C

Concentration:

49.6 other: % (m/m) by mass

Remarks on result:

other: pH Value of undiluted Test Item

pH value 2

pH value:

5.4

Temp.:

22 °C

Concentration:

0.5 other: wt %

Any other information on results incl. tables

Table 1: Results of the titrimetrical determinations of the pH value for undiluted and diluted test items

Test item	Sample ID	Equilibration time (min)	pH	Temperature	Mean pH
Undiluted	P1	1	2.03	21	2.02
Undiluted	P2	1	2.01	21
0.5 % solution	P3	10	5.39	22	5.40
0.5 % solution	P4	10	5.50	21

Table 2: Free acidity expressed as H2SO4 (% w/w) and as NaOH (mmol/L)

Acidity expressed as…	Sample ID	Weight of test item (g)	Consumption of NaOH (mL)	Concentration of NaOH (mol/L)	Titer	Acidity (% w/w)	Mean acidity (% w/w)
H2SO4 (% w/w)	P1	9.99	0.476	0.01	1.0435	0.0022	0.0023
	P2	10.07	0.497			0.0023
NaOH (mmol/L)	P1	9.99	0.476			0.5457	0.56
	P2	10.07	0.497			0.5652

Applicant's summary and conclusion

Conclusions:

The pH value of the test item (aqueous solution of hydrogen peroxide, 50 wt %) at 21 °C was tested to be 2.02.

Executive summary:

The pH value of an aqueous solution of hydrogen peroxide (50 wt %) was determined according to the method CEFIC PEROXYGENS H2O2 AM-7160 in duplicate. The pH was found to be 2.02 at 21 °C. For substances with pH values below 4, also the free acidity and the pH value of a 1 % aqueous dilution of the substance need to be determined. The free acidity was 0.0023 (expressed as H2SO4, % w/w). The pH value of the 1 % solution was 5.4.