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Physical & Chemical properties

Vapour pressure

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018-04-04 to 2018-08-07
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: vapour pressure balance
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0 Pa

The vapour pressure was measured in the temperature range of 63 to 97 °C. The measured vapour pressure values together with the measured temperatures are listed below

 

No.

Temperature / °C

Vapour pressure / Pa

1

63

7.93 × 10-4

2

73

2.48 × 10-3

3

78

5.33 × 10-3

4

83

9.82 × 10-3

5

87

1.54 × 10-2

6

92

2.78 × 10-2

7

97

4.11 × 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 = 16.1103

B = -6460.87

C = 273.15.

Conclusions:
The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C to be 1.2E-6 Pa, 2.8E-6 Pa and 1.3E-4 Pa 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. The vapour pressure was measured in the temperature range of 63 to 97 °C using the effusion method (vapour pressure balance). 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. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure was calculated to be 1.2 x E-6 Pa at 20 °C, 2.8 x E-6 Pa at 25 °C and and 1.3 x E-4 Pa at 50 °C respectively.

Description of key information

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C to be 1.2E-6 Pa, 2.8E-6 Pa and 1.3E-4 Pa respectively.

Key value for chemical safety assessment

Vapour pressure:
0 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 was measured in the temperature range of 63 to 97 °C using the effusion method (vapour pressure balance). 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. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure was calculated to be 1.2 x E-6 Pa at 20 °C, 2.8 x E-6 Pa at 25 °C and and 1.3 x E-4 Pa at 50 °C respectively (reference 4.6 -1).