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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:
2021-06-22
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:
2009
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Temp.:
20 °C
Vapour pressure:
88 Pa
Key result
Temp.:
25 °C
Vapour pressure:
123 Pa
Vapour pressure:
640.51 Pa

The vapour pressure was measured in the temperature range of 30 to 60 °C. For the


evaluation the vapour pressure values in the range of 30 to 60 °C were used. The measured


vapour pressure values together with the measured 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



30.0



6.4936 x 10-1



189.22



35.2



7.1833 x 10-1



211.09



41.2



8.5891 x 10-1



254.85



45.3



1.8335



547.57



50.3



2.1280



640.51



55.5



2.5062



760.36



60.2



2.9286



894.80



 


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
















Intercept



Slope



R. Squared



10.6002



-2537.3786



0.9281


Conclusions:
The vapour pressure of the test item was determined to be 123 Pa at 25 °C.
Executive summary:

An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC) No. 440/2008 Method A.4. and OECD Test Guideline 104 (2006) using the effusion method (Knudsen cell). The vapour pressure at 20 and 25 °C was extrapolated from the linear regression of the vapour pressure curve of the measurements performed in the range of 30 to 60 °C. The vapour pressure of the test item was determined to be 88 Pa and 123 Pa at 20 and 25 °C, respectively.

Description of key information

The vapour pressure of the test item was determined to be 123 Pa at 25 °C.

Key value for chemical safety assessment

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

Additional information

An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC) No. 440/2008 Method A.4. and OECD Test Guideline 104 (2006) using the effusion method (Knudsen cell). The vapour pressure at 20 and 25 °C was extrapolated from the linear regression of the vapour pressure curve of the measurements performed in the range of 30 to 60 °C. The vapour pressure of the test item was determined to be 88 Pa and 123 Pa at 20 and 25 °C, respectively.