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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:
April 28, 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
1.15 Pa
Temp.:
25 °C
Vapour pressure:
1.92 Pa

Table 1. Experimental values.

Temperature ºC

Vapour pressure (Pa)

Evaporation rate (µg/min)

38.40

6.99

5.44

43.00

10.86

8.39

47.80

16.94

12.98

52.70

24.85

18.90

From these values the following equation was obtained: log (p) = a-b/(t+273.15) where "a" was 13.4503 and "b" was 3925.66, with a R2 value of 0.9939. The calculated Vapour Pressure at 20ºC and 25ºC was 1.15 Pa and 1.92 Pa, respectively.

Vapour pressure

at 20ºC (Pa)

Vapour pressure

at 25ºC (Pa)

1.15

1.92

Conclusions:
The vapour pressure of the test item is 1.15 Pa at 20 ºC and 1.92 Pa at 25 ºC.
Executive summary:

The vapour pressure of the test item was determined by the effusion method (Knudsen cell), according to OECD 104 and EU A.4 method (GLP study). The vapour pressure of the test item was determined to be 1.15 Pa at 20ºC and 1.92 Pa at 25ºC.

Description of key information

Key study. Method according to OECD 104 and EU Method A.4 (Knudsen cell), GLP study. The vapour pressure of the test item is 1.15 Pa at 20ºC and 1.92 Pa at 25ºC.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the test item was determined by the effusion method (Knudsen cell), according to OECD 104 and EU A.4 method (GLP study). The vapour pressure of the test item was determined to be 1.15 Pa at 20ºC and 1.92 Pa at 25ºC.