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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2018-06-20 to 2019-02-05
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2008
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.025 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.037 Pa
Key result
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0.22 Pa

Thermal Stability

In the temperature range of 210-260 °C a small exothermic effect was observed, with a decomposition energy of -10 J/g. The test was terminated at 300 °C.

Table 1: Results of the DSC-measurement

No.

Sample weight / mg

Start/°C

Energy / J/g

1

12.00

210 (exothermic)

-10

 

Effusion method: Vapour pressure balance

The vapour pressure was measured in the temperature range of 37 to 78 °C.

Table 2: Results of the Effusion method

No.

Temperature / °C

Vapour pressure / Pa

1

37

8.16 x 10E-2

2

42

1.24 x 10E-1

3

47

1.83 x 10E-1

4

52

2.71 x 10E-1

5

58

3.72 x 10E-1

6

63

5.30 x 10E-1

7

68

7.17 x 10E-1

8

73

8.66 x 10E-1

9

78

1.06 x 10E-0

 

From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation werederived by regression (A = 8.5697, B = -2983.07, C = 273.15).

 

Table 3: Calculated vapour pressure values for 20, 25 and 50 °C

Temperature / °C

Vapour pressure / Pa

20

2.5 x 10E-2

25

3.7 x 10E-2

50

2.2 x 10E-1

Conclusions:
The vapour pressure of the test item was calculated to be 0.037 Pa at 25 °C.
Executive summary:

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, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD 104 (2006). The obtained results are 0.025, 0.037 and 0.22 Pa at 20, 25 and 50 °C respectively.

Description of key information

The vapour pressure of the test item was calculated to be 0.037 Pa at 25 °C.

Key value for chemical safety assessment

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

Additional 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, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure and OECD 104 (2006). The obtained results are 0.025, 0.037 and 0.22 Pa at 20, 25 and 50 °C respectively.