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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:
10.01. - 11.01.13
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 hPa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 hPa
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0 hPa

The vapour pressure was measured in the temperature range of 30 °C to 80 °C. The measured vapour pressures at the corresponding temperatures are listed below:

 

Temperature / °C

Vapour pressure / hPa

44.0

1.27 x 10E-5

48.0

 2.13 x 10E-5

52.6

4.72 x 10E-5

56.1

 8.63 x 10E-5

59.1

9.97 x 10E-5

 59.9

1.30 x 10E-4

 65.3

2.80 x 10E-4

 70.7

5.88 x 10E-4

 76.7

1.99 x 10E-3

 81.6

1.91 x 10E-3

 86.1

2.88 x 10E-4

 

Since the test did not yield vapour pressures sufficiently high to extrapolate to 20, 25 and 50 °C these values were estimated.

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

 

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

 

20 °C: 2.8x10E-5 Pa

25 °C: 6.5x10E-5 Pa

50 °C: 3.2x10E-3 Pa

 

Conclusions:
The vapour pressure of the test item at 25 °C was determined to be 6.5x10E-5 Pa.
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 in the temperature range 44 -86 °C. The vapour pressure was calculated to be 2.8 x 10E-5 Pa at 20 °C and 6.5 x 10E-5 Pa at 25 °C and 3.2 x 10E-3 Pa at 50 °C respectively.

Description of key information

The vapour pressure of the test item at 25 °C was determined to be 6.5x10E-5 Pa.

Key value for chemical safety assessment

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

Additional information

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 in the temperature range 44 -86 °C. The vapour pressure was calculated to be 2.8 x 10E-5 Pa at 20 °C and 6.5 x 10E-5 Pa at 25 °C and 3.2 x 10E-3 Pa at 50 °C respectively.