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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:
2020-05-18
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Temp.:
20 °C
Vapour pressure:
0 Pa

The vapour pressure was measured in the temperature range of 61 to 81 °C.


Results of the Effusion method




































No.



Temperature / °C



Vapour pressure / Pa



1



61



9.15 x 10-3



2



66



1.74 x 10-2



3



71



3.30 x 10-2



4



76



5.73 x 10-2



5



81



9.66 x 10-2



The logarithm of the vapour pressure was plotted as a function of the inverse temperature 1/T. From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation


can be derived by regression of the data points to


A = 16.0327


B = -6031.48


C = 273.15.


The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C.


Calculated vapour pressure values for 20, 25 and 50 °C






















Temperature / °C



Vapour pressure / Pa



20



2.9 × 10-5



25



6.4 × 10-5



50



2.3 × 10-3


Conclusions:
The vapour pressure of the test item was found to be 6.4 x 10-5 Pa at 25 °C.
Executive summary:

The vapour pressure of the test item was determined using the Effusion method: Knudsen cell according to OECD Test Guideline 104 (2006). The vapour pressure was determined at 61, 66, 71, 76 and 81 °C. The logarithm of the vapour pressure was plotted as a function of the inverse temperature 1/T. The vapour pressure at 20, 25 and 50 °C was determined by linear regression of the measured values. The vapour pressure of the test item was found to be 2.9 × 10-5, 6.4 x 10-5  and 2.3 × 10-3 Pa at 20, 25 and 50 °C.

Description of key information

The vapour pressure of the test item was found to be 6.4 x 10-5 Pa at 25 °C (reference 4.6-1).


 

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the test item was determined using the Effusion method: Knudsen cell according to OECD Test Guideline 104 (2006). The vapour pressure was determined at 61, 66, 71, 76 and 81 °C. The logarithm of the vapour pressure was plotted as a function of the inverse temperature 1/T. The vapour pressure at 20, 25 and 50 °C was determined by linear regression of the measured values. The vapour pressure of the test item was found to be 2.9 × 10-5, 6.4 x 10-5  and 2.3 × 10-3 Pa at 20, 25 and 50 °C.

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