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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:
from 2017-04-18 to 2017-06-12
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
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
20 °C
Vapour pressure:
0.015 Pa
Temp.:
25 °C
Vapour pressure:
0.029 Pa
Temp.:
50 °C
Vapour pressure:
0.7 Pa

Table 1: Measured vapour pressures and corresponding temperatures

Temprature / °C

Vapour pressure / hPa

20

1.5E-4

30

5.3E-4

40

2.2E-3

50

8.3E-3

60

2.5E-2

70

5.6E-2

The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C.

Table 2: Antoine parameters and extrapolated vapour pressures

T / °C

p / hPa

log (p/hPa) = A + B/(C+T[°C])

20

1.5E-4

A = 14.27172

25

2.9E-4

B = -5308.59

50

7.0E-3

C = 273.15

The following vapour pressure values for the test item were interpolated from the experimental data:

Table 3: Final results

T / °C

p / hPa

p / Pa

20

1.5E-4

1.5E-2

25

2.9E-4

2.9E-2

50

7.0E-3

7.0E-1

 

Conclusions:
The vapour pressure for the test item was interpolated to be 0.015 Pa at 20 °C, 0.029 Pa at 25 °C and 0.7 Pa at 50 °C, respectively.
Executive summary:

A study was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at temperatures from 20 to 70 °C using the effusion method (vapour pressure balance). The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure wasinterpolated to be 0.015 Pa at 20 °C, 0.029 Pa at 25 °C and 0.7 Pa at 50 °C, respectively.

Description of key information

The vapour pressure for the test item was interpolated to be 0.015 Pa at 20 °C, 0.029 Pa at 25 °C and 0.7 Pa at 50 °C, respectively.

Key value for chemical safety assessment

Vapour pressure:
0.015 Pa
at the temperature of:
20 °C

Additional information

A study (reference 4.6-1) was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at temperatures from 20 to 70 °C using the effusion method (vapour pressure balance). The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure was interpolated to be 0.015 Pa at 20 °C, 0.029 Pa at 25 °C and 0.7 Pa at 50 °C, respectively.