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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 2004-01-12 to 2004-02-04
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
[adopted on 27 July 1995]
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
[Directive 92/69/EEC, Official Journal L383 A 1992]
Deviations:
no
GLP compliance:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Type of method:
dynamic method
Key result
Temp.:
20 °C
Vapour pressure:
3.4 hPa

From the beginning until approx. 90 °C the sample w as boiling intermittent.

 

Vapour pressure [hPa]

Boiling temperature [°C]

Inverse temperature

x 1000 [K-1]

9.5

35.10

3.244

18.5

46.32

3.130

41.7

60.15

3.000

93.1

78.01

2.848

187.6

95.29

2.714

300.4

108.09

2.623

717.0

134.22

2.455

916.4

142.14

2.408

Calculated pressure:

3.4

20

3.411

The vapour pressure of the test item at 20 °C was c alculated by mathematical extrapolation using the Antoine equation. It was determined to be 3.4 hPa (at 20 °C).

Antoine equation:

log p = A – B / (T + C)

[p in hPa; T in °C]

A = 6.914750

B = 1273.1130

C = 179.40192

Conclusions:
The vapour presure of the test item was calculated to be 3.4 hPa at 20 °C.
Executive summary:

A study following OECD 104 and EU A.4 was performed to determine the vapour pressure of the test item. A portion of the test item was given in a glass apparatus. A thermometer was placed in the vapour above the surface of the liquid. The measurements started at the initial pressure of 9.5 hPa and at thermodynamic equilibrium. The pressure was increased stepwise up to a final pressure of 916.4 hPa. The temperature of the vapour was measured as a function of the pressure. From the beginning until approx. 90 °C the sample w as boiling intermittent. The vapour pressure of the test item at 20 °C was calculated by mathematical extrapolation using the Antoine equation. It was determined to be 3.4 hPa (at 20 °C).

Description of key information

The vapour presure of the test item was calculated to be 3.4 hPa at 20 °C.

Key value for chemical safety assessment

Vapour pressure:
3.4 hPa
at the temperature of:
20 °C

Additional information

A study following OECD 104 and EU A.4 was performed to determine the vapour pressure of the test item. A portion of the test item was given in a glass apparatus. A thermometer was placed in the vapour above the surface of the liquid. The measurements started at the initial pressure of 9.5 hPa and at thermodynamic equilibrium. The pressure was increased stepwise up to a final pressure of 916.4 hPa. The temperature of the vapour was measured as a function of the pressure. From the beginning until approx. 90 °C the sample was boiling intermittent. The vapour pressure of the test item at 20 °C was calculated by mathematical extrapolation using the Antoine equation. It was determined to be 3.4 hPa (at 20 °C).