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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:
10.05. - 25.07.06
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: vapour pressure balance
Temp.:
20 °C
Vapour pressure:
0 hPa
Key result
Temp.:
25 °C
Vapour pressure:
0.001 hPa
Temp.:
50 °C
Vapour pressure:
0.054 hPa

The vapour pressure was measured in the temperature range of 25 °C to 46 °C. The measured vapour pressures at the corresponding temperatures are listed in Table 1.

 

Table 1: Measured vapour pressures and corresponding temperatures

No

Temperature /°C

Vapour pressure / hPa

1

25.0

  2.8 x 10-5

2

25.9

  5.7 x 10-5

3

27.2

  6.1 x 10-5

4

31.9

  1.1 x 10-4

5

32.0

  4.2 x 10-4

6

32.0

  7.1 x 10-4

7

32.1

  8.6 x 10-4

8

32.2

  1.2 x 10-3

9

32.2

  1.5 x 10-3

10

32.1

  1.7 x 10-3

11

35.1

  4.0 x 10-3

12

35.1

  4.1 x 10-3

13

39.5

  9.2 x 10-3
 14  39.5  8.7 x 10-3
 15  41.7  1.3 x 10-2
 16  44.5  2.0 x 10-2
 17  46.1  2.6 x 10-2
 18  46.3  2.7 x 10-2

 

The course of the vapour pressure as a function of the inverse temperature shows an untypical profile in the temperature range 25 - 32 °C. At the beginning of the measurement the test item is a solid up to a temperature of approximately 30 °C. Above 30 °C the test item started to melt. The data points: 4- 10 at approximately 32 °C show the melting of test item accompanied with the increase of the vapour pressure. Above 35 °C the test item was melted totally and the vapour pressure showed its typical curve. Due to this the regression according to the Antoine equation was performed only for the vapour pressure of the melted substance (data points 11 -18). This gives a conservative estimation of the vapour pressure of the test item also at 20 and 25 °C.

Table 2 : Final vapour pressures

T/°C

p/hPa

p/Pa

20

1.9E-4

1.9E-2

25

5.2E-4

5.2E-2

50

5.4E-2

5.4E-0
Conclusions:
The vapour pressure of the test item was determined to be 1.9E-2 Pa (20 °C), 5.2E-2 Pa (25 °C) and 5.4E-0 Pa (50 °C).
Executive summary:

A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. The vapour pressure was measured by determining the boiling point of the test item at various temperatures between about 25 °C to 46 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results:  1.9E-2 Pa (20 °C), 5.2E-2 Pa (25 °C) and 5.4E-0 Pa (50 °C).

Description of key information

A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. The vapour pressure was measured by determining the boiling point of the test item at various temperatures between about 25 °C to 46 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results:  1.9E-2 Pa (20 °C), 5.2E-2 Pa (25 °C) and 5.4E-0 Pa (50 °C).

Key value for chemical safety assessment

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

Additional information