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Vapour pressure

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Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2020-10-20 to 2020-11-20
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:
23.03.2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
24.08.2009
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Temp.:
20 °C
Vapour pressure:
0.002 Pa
Remarks on result:
other: Molecular weight 344.4 g/mol
Temp.:
25 °C
Vapour pressure:
0.004 Pa
Remarks on result:
other: Molecular weight 344.4 g/mol
Key result
Temp.:
20 °C
Vapour pressure:
0.003 Pa
Remarks on result:
other: Molecular weight 217.3 g/mol
Temp.:
25 °C
Vapour pressure:
0.004 Pa
Remarks on result:
other: Molecular weight 217.3 g/mol

The vapour pressure was calculated using the following equation:


p = m/(K A t) √([2 π R T] / M)


with



















































Parameter



Explanation



Source/Value



p



vapour pressure in Pa



to be calculated



m



weight loss in kg



experimental value



t



time in s



experimental value



A



area of aperture in m2



17.85 * 10-7m2 (for d = 1mm)



K



correction factor



0.909



R



universal gas constant in J/mol*K



8.314472



T



temperature in K



experimental value



M



molecular weight in kg/mol



0.2173 – 0.3444



 


As the substance consists of two constituents with different molecular weights, the vapour pressure was calculated for both of them.


 


Calculation Results for the molecular mass of 217.3 g/mol




































T



Mean p



1/T



log p



K



Pa



1/K



log Pa



333.2



9.50E-02



3.0012E-03



-1.0225



348.2



2.71E-01



2.8719E-03



-0.5676



363.2



8.09E-01



2.7533E-03



-0.0919



 


A graph with log p vs. 1/T was plotted. Since the values were correlated by a linear relation, the data could be fitted by linear regression. The parameter of the linear regression are given in the next table.


























Parameter



Value



Slope



-3750.1



Intercept



10.2228



Correlation Coefficient r



-0.9993



Coefficient of Determination r2



0.9986



 


Calculation Results for the molecular mass of 334.4 g/mol




































T



Mean p



1/T



log p



K



Pa



1/K



log Pa



333.2



7.54E-02



3.0012E-03



-1.1225



348.2



2.15E-01



2.8719E-03



-0.6676



363.2



6.43E-01



2.7533E-03



-0.1919



A graph with log p vs. 1/T was plotted. Since the values were correlated by a linear relation, the data could be fitted by linear regression. The parameter of the linear regression are given in the next table.


























Parameter



Value



Slope



-3750.1



Intercept



10.1228



Correlation Coefficient r



-0.9993



Coefficient of Determination r2



0.9986


Conclusions:
The vapour pressure of the test item at 20 °C was determined to be 0.00269 Pa.
Executive summary:

An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC), Method A.4 and OECD 104 using the effusion method (weight loss). The vapour pressure was determined at three different temperatures (60, 75 and 90 °C). As the test item consists of two constituents with different molecular weights, the vapour pressure was calculated for both of them. The determined log p values were plotted against 1/T. The vapour pressure at 20 and 25 °C was extrapolated from the linear regression. For a molecular weight of 217.3 g/mol the vapour pressure of the test item at 20 and 25 °C was determined to be 0.00269 and 0.00441 Pa, respectively. For a molecular weight of 334.4 g/mol the vapour pressure of the test item at 20 and 25 °C was determined to be 0.00214 and 0.00351 Pa, respectively. As key value for the chemical safety assessment the higher value of the smaller molecule, 0.00269 Pa at 20 °C, is used as worst case approach.

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
disregarded due to major methodological deficiencies
Study period:
1998
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
cited as: Directive 92/69/EEC, A4 dated 29 Dec 1992
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: vapour pressure balance
Key result
Temp.:
25 °C
Vapour pressure:
0.17 Pa
Remarks on result:
other: Estimated vapour pressure value.

The results are taken from extrapolation from the temperature range 18 °C - 34 °C.

Conclusions:
The vapour pressure was determined to be 0.17 Pa at 25 °C.
Executive summary:

A study was conducted according to Directive 92/69/EEC Method A.4 to determine the vapour pressure of the test item Incozol LV. The vapour pressure was determined to be 0.17 Pa at 25 °C.

Description of key information

The vapour pressure of the test item at 20 °C was determined to be 0.00269 Pa.


 

Key value for chemical safety assessment

Vapour pressure:
0.003 Pa
at the temperature of:
20 °C

Additional information

An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC), Method A.4 and OECD 104 using the effusion method (weight loss). The vapour pressure was determined at three different temperatures (60, 75 and 90 °C). As the test item consists of two constituents with different molecular weights, the vapour pressure was calculated for both of them. The determined log p values were plotted against 1/T. The vapour pressure at 20 and 25 °C was extrapolated from the linear regression. For a molecular weight of 217.3 g/mol the vapour pressure of the test item at 20 and 25 °C was determined to be 0.00269 and 0.00441 Pa, respectively. For a molecular weight of 334.4 g/mol the vapour pressure of the test item at 20 and 25 °C was determined to be 0.00214 and 0.00351 Pa, respectively. As key value for the chemical safety assessment the higher value of the smaller molecule, 0.00269 Pa at 20 °C, is used as worst case approach.