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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:
15.-18.08.2016
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:
European Commission Regulations (EC) No. 440/2008 and No. 761/2009,
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Key result
Temp.:
50 °C
Vapour pressure:
0 Pa

The vapour pressure was measured in the temperature range of 90 °C to 115 °C. The measured vapour pressures at the corresponding temperatures are listed in the table. After the measurement the test item remained visually unchanged. No mass loss occurred.


 


Table 1: Measured vapour pressures and corresponding temperatures


































Temperature /°C



Vapour pressure  / hPa



90



1.5x10-4



95



3.5x10-4



100



6.0x10-4



105



1.0x10-3



110



1.7x10-3



115



2.7x10-3



 


 


 


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


















A



15.32918



B



-6931.38



C



273.15



 


Table3 : Final vapour pressures


























T/°C



p/hPa



p/Pa



20



4.5E-9



4.5E-7



25



1.1E-8



1.1E-6



50



7.1E-7



7.1E-5





Conclusions:
The vapour pressure of the test item was determined to be 4.5E-7 Pa (20 °C), 1.1E-6 Pa (25 °C) and 7.1E-5 Pa (50 °C).
Executive summary:

A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. The vapour pressure was measured using the Knudsencell at various temperatures between about 90 and 115 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results:  4.5E-7 Pa (20 °C), 1.1E-6 Pa (25 °C) and 7.1E-5 Pa (50 °C).

Description of key information

The vapour pressure of the test item was determined to be XXX Pa (20 °C), XXX Pa (25 °C) and XXX Pa (50 °C) using the effusion method.

Key value for chemical safety assessment

at the temperature of:
25 °C

Additional information

A study was performed according to OECD TG 104 and Commission Regulation (EC) No. 440/2008, method A.4 in order to determine the vapour pressure of the test item by using the effusion method. The vapour pressure was measured by determining the boiling point of the test item at various temperatures between about 90 and 115 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results:  4.5E-7 Pa (20 °C), 1.1E-6 Pa (25 °C) and 7.1E-5 Pa (50 °C)