2,2-bis(methylthio)propane

pH

Administrative data

Endpoint:

pH

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2012

Report date:

2012

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

CIPAC MT 75 (Determination of pH Values)

Deviations:

yes

Remarks:

For the test on pure test item, one assay was performed, as the test item damaged the probe.

Test guideline 2

Qualifier:

according to guideline

Guideline:

CIPAC MT 75 (Determination of pH Values)

Deviations:

yes

Remarks:

For the pure test item and the test item solution at 300 mg/L in demineralised water, the difference of temperature between the reference item solution and t

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

-

EC Number:

478-900-1

EC Name:

-

Cas Number:

6156-18-9

Molecular formula:

C5 H12 S2

IUPAC Name:

2,2-bis(methylthio)propane

Details on test material:

Identification Bis methyl thiopropane
CAS number 6156-18-9
Appearance colourless limpid liquid
purity 97.3%

Results and discussion

pH value

pH value 1

pH value:

5.67

Temp.:

21 °C

Concentration:

300 mg/L

pH value 2

pH value:

4.85

Temp.:

20.3 °C

Concentration:

other: pure

Any other information on results incl. tables

Test item at 300 mg/L in demineralized water

Reference item: Potassium hydrogen phtalate 0.05 mol/L

Measured pH value 3.95 at 20.9 °C

Theoretical pH value 4.00 at 20.0 °C

The value was accepted. Test item at 300 mg/L in demineralized water:

Assay No.	After1min		After2min		After10min
	pHvalues	Temperature (°C)	pHvalues	Temperature (°C)	pHvalues	Temperature (°C)
1	5.99	21.5	5.88	21.5	5.73	21.0
2	5.70	21.4	5.70	21.4	5.60	20.9

Pure test item

Reference item:

Potassium hydrogen phtalate 0.05 mol/L

Measured pH value 4.05 at 20.7 °C

Theoretical pH value 4.00 at 20.0 °C

The value was accepted

Pure test item:

Assay No.	After1min		After2min		After10min
	pHvalues	Temperature (°C)	pHvalues	Temperature (°C)	pHvalues	Temperature (°C)
1	5.18	19.1	5.55	19.3	4.85	20.3

Applicant's summary and conclusion

Conclusions:

The pH mean value of the test item at 300 mg/L in demineralised water was:
5.85 at 21.5 °C after 1 min
5.79 at 21.5 °C after 2 min
5.67 at 21.0 °C after 10 min
The pH value of the pure test item was:
5.18 at 19.1 °C after 1 min
5.55 at 19.3 °C after 2 min
4.85 at 20.3 °C after 10 min