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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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
23 July 2009
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
25 °C
Vapour pressure:
184.2 Pa
Key result
Temp.:
20 °C
Vapour pressure:
139.02 Pa

The vapour pressure was measured in the temperature range of 30 to 45 °C. For the evaluation the vapour pressure values in the range of 30 to 45 °C were used. The measured vapour pressure values together with the temperatures and the regression data of the vapour pressure curve can be seen in Tables 1 and 2, respectively.

Table 1. Results of the Effusion method

 

Temperature, °C

Δm/Δt, mg/min

Vapour pressure, Pa

 

30.1

8.3180 x 10-1

246.30

 

33.5

9.8249 x 10-1

292.54

 

36.6

1.0179

304.61

 

39.7

1.4525

436.89

 

42.4

1.6052

484.84

 

45.6

1.6664

505.92

 

Table 2. Regression data of the vapour pressure curve - Regression output

 

Intercept

Slope

R. Squared

 

9.4305

-2136.3051

0.9399
Conclusions:
The estimated vapour pressure of the test item at 25 °C is 184.2 Pa.
Executive summary:

The vapour pressure of the test item has been determined in an experimental study according to OECD TG 104 (2006), Regulations (EU) No. 440/2008 and No. 761/2009, Method A.4. and OPPTS 830.7950. A Knudsen cell (effusion method) was used to measure the vapour pressure of the test item in the temperature range of 30.1 °C to 45.6 °C. Overall six data points were measured. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C The estimated values are 139.02 Pa at 20 °C and 184.20 Pa at 25 °C.

Description of key information

The estimated vapour pressure of the test item at 25 °C is 184.20 Pa.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the test item has been determined in an experimental study according to OECD Guideline No. 104 (2006), Regulations (EU) No. 440/2008 and No. 761/2009, Method A.4. and OPPTS 830.7950. A Knudsen cell (effusion method) was used to measure the vapour pressure of the test item in the temperature range of 30.1 °C to 45.6 °C. Overall six data points were measured. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C The estimated values are: 20 °C: 139.02 Pa, 25 °C: 184.20 Pa.