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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:
18. - 19.12.2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Temp.:
20 °C
Vapour pressure:
0.002 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0.004 Pa
Temp.:
50 °C
Vapour pressure:
0.087 Pa

The vapour pressure was measured in the temperature range of 30 °C to 90 °C. After the last measurement a mass loss of approx. 100 % (w/w) was determined. The sample was already totally evaporated during the measurement at 90 °C. Hence, the results at 90 °C are not evaluated.


Table 1: Measured vapour pressures and corresponding temperatures






































Temperature / °C



Vapour pressure / hPa



30.1



8.5 x 10-5



40.3



2.6 x 10-4



50.2



8.8 x 10-4



60.2



2.8 x 10-3



70.2



7.6 x 10-3



80.1



1.9 x 10-2



90.2



n.e.



n.e.: not evaluable


 


The data point measured at 80.1 °C was included in the linear regression because it is only slightly above the recommended range for the vapour pressure of the vapour pressure balance method.


The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C as shown in Table 2.


Table 2: Antoine parameters and extrapolated vapour pressures


























T/°C



p/hPa



log (p/hPa) = A + B/(C+T[°C])



20



2.1 x 10-5



A = 12.75647



25



4.1 x 10-5



B = -5111.55



50



8.7 x 10-4



C = 273.15



 

Conclusions:
The vapour pressure of the test substance was 0.0041 Pa at 25 °C, 0.0021 Pa at 20 °C and 0.087 Pa at 50 °C, respectively.
Executive summary:

A study was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item using the effusion method: vapour pressure balance. The vapour pressure of the test item was determined at temperatures between 30 and 90 °C. After the last measurement a mass loss of approx. 100 % (w/w) was determined. The sample was already totally evaporated during the measurement at 90 °C. Hence, the results at 90 °C are not evaluated. Using the Antoine equation, the constants A and B were determined and the vapour pressure of the test item at 20, 25 and 50 °C was extrapolated from the experimental vapour pressure. The vapour pressure was calculated to be 0.0021 Pa at 20 °C, 0.0041 Pa at 25 °C and 0.087 Pa at 50 °C, respectively.

Description of key information

The vapour pressure of the test substance was 0.0041 Pa at 25 °C, 0.0021 Pa at 20 °C and 0.087 Pa at 50 °C, respectively (reference 4.6-1).

Key value for chemical safety assessment

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

Additional information

A study was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item using the effusion method: vapour pressure balance. The vapour pressure of the test item was determined at temperatures between 30 and 90 °C. After the last measurement a mass loss of approx. 100 % (w/w) was determined. The sample was already totally evaporated during the measurement at 90 °C. Hence, the results at 90 °C are not evaluated. Using the Antoine equation, the constants A and B were determined and the vapour pressure of the test item at 20, 25 and 50 °C was extrapolated from the experimental vapour pressure. The vapour pressure was calculated to be 0.0021 Pa at 20 °C, 0.0041 Pa at 25 °C and 0.087 Pa at 50 °C, respectively (reference 4.6-1).

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