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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:
2022-09-07
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:
2009
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:
static method
Key result
Temp.:
20 °C
Vapour pressure:
3 119 Pa
Key result
Temp.:
25 °C
Vapour pressure:
3 862 Pa

The calculation results are presented in the following table:


Table: Calculated values for 1/T and log P






































































































n



Temperature T



Pressure p



Temperature T



1/T



log p



 



°C



hPa



K



1/K



log Pa



1



20.0



30.5



293.15



0.00341122



3.4843



2



29.8



47.6



302.95



0.00330087



3.6776



3



39.0



70.2



312.15



0.00320359



3.8463



4



47.7



93.8



320.85



0.00311672



3.9722



5



55.5



120.8



328.65



0.00304275



4.0821



6



47.0



91.4



320.15



0.00312354



3.9609



7



38.5



66.5



311.65



0.00320873



3.8228



8



29.1



45.8



302.25



0.00330852



3.6609



9



21.0



32.5



294.15



0.00339963



3.5119



10



15.5



25.6



288.65



0.00346440



3.4082



 


The parameters for the linear regression of the graph log (p) vs. 1/T are presented in the following table:


Table: Linear Regression Parameters


























Parameter



Value



Slope



-1623.209439



Intercept



9.031138491



Correlation coefficient r



-0.999526169



Coefficient of determination r2



0.999052563



 


From the values of these parameters, vapour pressures at 20.0 and at 25.0 °C were calculated using the following equation:


Table: Calculated Values for vapour pressure





















Parameter



Value



Unit



Vapour Pressure (20.0 °C)



3119



Pa



Vapour Pressure (25.0 °C)



3862



Pa


Conclusions:
The vapour pressure of the test item at 25 °C was determined to be 3862 Pa.
Executive summary:

An experimental study was conducted to determine the vapour pressure of the test item according to EU Method A.4. and OECD Test Guideline 104 using the static method. The vapour pressure at 20 and 25 °C was calculated from the linear regression of the vapour pressure curve of the measurements performed in the range of 15.5 to 55.5 °C. The vapour pressure of the test item at 20 and 25 °C was determined to be 3119 and 3862 Pa, respectively.

Description of key information

The vapour pressure of the test item at 25 °C was determined to be 3862 Pa.

Key value for chemical safety assessment

Vapour pressure:
3 862 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 EU Method A.4. and OECD Test Guideline 104 using the static method. The vapour pressure at 20 and 25 °C was calculated from the linear regression of the vapour pressure curve of the measurements performed in the range of 15.5 to 55.5 °C. The vapour pressure of the test item at 20 and 25 °C was determined to be 3119 and 3862 Pa, respectively.