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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:
10.-11.10.2017
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)
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
20 °C
Vapour pressure:
0.001 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0.001 Pa
Key result
Temp.:
50 °C
Vapour pressure:
0.006 Pa

The vapour pressure was measured in the temperature range of 70 and 110 °C. The measured vapour pressures at the corresponding temperatures are listed in Table 1. After the measurement a mass loss of approx. 100 % (w/w) was determined.


 


Table 1: Measured vapour pressures and corresponding temperatures






























Temperature /°C



Vapour pressure  / hPa



70



1.6 x 10-4



80



6.2 x 10-4



90



8.2 x 10-4



100



9.8 x 10-4



110



2.8 x 10-5



 


The vapour pressure showed an unusual behaviour. As a conservative approach the data points measured between 70 °C and 100 °C were used for in the linear regression. The data point at 110 °C was most likely already influenced by a nearly empty crucible and therefore not included in the regression. 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



5.58261



B



-3168.58



C



273.15



 


Table3 : Final vapour pressures


























T/°C



p/hPa



p/Pa



20



5.9 E-6



5.9 E-4



25



9.0 E-6



9.0 E-4



50



6.0 E-5



6.0 E-3



 

Conclusions:
The vapour pressure of the test substance was determined to be 0.00059 Pa at 20 °C, 0.0009 Pa at 25°C and 0.006 Pa at 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 Knudsen cell at various temperatures between about 70 and 110 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results: 0.00059 Pa at 20 °C, 0.0009 Pa at 25°C and 0.006 Pa at 50 °C.

Description of key 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 using the Knudsen cell at various temperatures between about 70 and 110 °C. The vapour pressures of the test item at 20, 25 and 50 °C were extrapolated by using the Antoine constants with following results: 0.00059 Pa at 20 °C, 0.0009 Pa at 25°C and 0.006 Pa at 50 °C.

Key value for chemical safety assessment

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

Additional information