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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2015-12-17 to 2016-02-25
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
Remarks:
The study was conducted under supervision of a quality assurance unit which had ensured e.g instrumentation validation, reagent/materials certification, analyst certification and providing standard operating procedures.
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.33 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.53 Pa
Key result
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
4.7 Pa

Thermal Stability
In the temperature range of 25 – 300 °C no thermal effects were observed.

 

Effusion method: Knudsen cell
The vapour pressure was measured in the temperature range of 35 to 56 °C.

 

Results of the Effusion method 

No.

Temperature / °C

Vapour pressure / Pa

1

35

1.51

2

41

1.92

3

46

3.09

4

51

4.91

5

56

7.70

 

From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation was derived by regression of the data points to: 
A = 11.9618
B = -3649.21
C = 273.15

 

The vapour pressure of the test item was calculated by interpolation and extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C.

Conclusions:
The vapour pressure of the test item was determined to be 0.33 Pa at 20 °C, 0.53 Pa at 25 °C and 4.7 Pa at 50 °C respectively.
Executive summary:

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. Using the effusion method with Knudsen cells the vapour pressure was measured in the temperature range of 35 to 56 °C. A vapour pressure curve with 5 data points was measured. From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation was derived and the vapour pressure of the test item as calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. The vapour pressure of the test item was determined to be 0.33 Pa at 20 °C, 0.53 Pa at 25 °C and 4.7 Pa at 50 °C respectively.

Description of key information

The vapour pressure of the test item was determined to be 0.33 Pa at 20 °C, 0.53 Pa at 25 °C and 4.7 Pa at 50 °C respectively.

Key value for chemical safety assessment

Vapour pressure:
0.53 Pa
at the temperature of:
25 °C

Additional information

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. Using the effusion method with Knudsen cells the vapour pressure was measured in the temperature range of 35 to 56 °C. A vapour pressure curve with 5 data points was measured. From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation was derived and the vapour pressure of the test item as calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C, according to Regulation EC No. 440/2008 Method A.4. The vapour pressure of the test item was determined to be 0.33 Pa at 20 °C, 0.53 Pa at 25 °C and 4.7 Pa at 50 °C respectively.