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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:
2018-02-19 to 2018-03-21
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.001 Pa
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.001 Pa
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0.005 Pa

The vapour pressure was measured in the temperature range of 85.9 to 111.0 °C. The measured vapour pressure values together with the measured temperatures are listed belwo:

 

No.

Temperature / °C

Vapour pressure / Pa

1

85.9

2.56 x 10-2

2

90.9

2.96 x 10-2

3

95.9

3.68 x 10-2

4

100.9

4.46 x 10-2

5

105.9

5.30 x 10-2

6

111.0

6.26 x 10-2

 

From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation can be derived by regression of the data points to

A = 4.4930

B = -2187.56

C = 273.15.

 

The vapour pressure of the test item calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C is shown below:

 

Temperature / °C

Vapour pressure / Pa

20

1.1 ×10-3

25

1.4 ×10-3

50

5.3 ×10-3

 

Conclusions:
The vapour pressure of the test item was determined to be 0.0011 Pa at 20 °C.
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. The vapour pressure of the test item was determined in the temperature range of 85.9 to 111.0 °C using the effusion method (weight loss). All measured values showed good reproducibility, giving relative standard deviations of less than 25 %, and perfect correlation. Therefore, the result of the test according to the guideline criteria was considered to be valid. 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. The vapour pressure of the test item calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C are 0.0011, 0.0014 and 0.0053 Pa respectively.

 

 

Description of key information

The vapour pressure of the test item was determined to be 0.0011 Pa at 20 °C.

Key value for chemical safety assessment

Vapour pressure:
0.001 Pa
at the temperature of:
20 °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. The vapour pressure of the test item was determined in the temperature range of 85.9 to 111.0 °C using the effusion method (weight loss). All measured values showed good reproducibility, giving relative standard deviations of less than 25 %, and perfect correlation. Therefore, the result of the test according to the guideline criteria was considered to be valid. 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. The vapour pressure of the test item calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C are 0.0011, 0.0014 and 0.0053 Pa respectively.