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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:
form 2015-10-13 to 2015-11-04
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:
2006-03-23
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2009-08-24
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Version / remarks:
1996-08
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Key result
Temp.:
20 °C
Vapour pressure:
0.004 Pa
Temp.:
25 °C
Vapour pressure:
0.005 Pa

The following vapour pressures were determined experimentally and considered as valid (mean and standard deviation given):


Experimentally Determined Vapour Pressures
















































T



T



P



Stand. Dev. P



RSD P



°C



K



Pa



Pa



%



30.0



303.2



6.58E-03



8.49E-04



12.9 %



45.0



318.2



1.24E-02



2.86E-03



22.9 %



60.0



333.2



2.50E-02



8.62E-03



34.4 %



75.0



348.2



4.32E-02



7.55E-03



17.5 %



Stand. Dev. = Standard Deviation; RSD = Relative Standard Deviation


 


The linear regression of log P vs. 1/T gave a correlation coefficient r of - 0.9994, showing good repeatability and precision. Therefore, the determination is considered as valid. For the test item, the following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation:


 














Vapour pressure at 20 °C:



3.90*10-03 Pa



Vapour pressure at 25 °C:



5.04*10-03 Pa


Conclusions:
The estimated vapour pressure of the test item at 20 °C is 3.90E-3 Pa.
Executive summary:

The vapour pressure of test item has been determined according to the effusion method described in OECD Guideline 104 and EU Regulation No 761/2009, Method A.4. The method is based on the estimation of the mass of test item flowing out per unit of time of a Knudsen cell in the form of vapour, through a micro-orifice under ultra-vacuum conditions. The mass of effused vapour was obtained by determining the loss of mass of the cell. The vapour pressure was calculated by applying the Hertz-Knudsen relation. The vapour pressure of the test item was determined at four different temperatures (30, 45, 60 and 75 °C). The vapour pressures at 20 and 25 °C were calculated from the linear regression equation to be 3.90E-3 and 5.04E-3 Pa, respectively.

Description of key information

The estimated vapour pressure of the test item at 20 °C is 3.90E-3 Pa.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of test item has been determined according to the effusion method described in OECD Guideline 104 and EU Regulation No 761/2009, Method A.4. The method is based on the estimation of the mass of test item flowing out per unit of time of a Knudsen cell in the form of vapour, through a micro-orifice under ultra-vacuum conditions. The mass of effused vapour was obtained by determining the loss of mass of the cell. The vapour pressure was calculated by applying the Hertz-Knudsen relation. The vapour pressure of the test item was determined at four different temperatures (30, 45, 60 and 75 °C). The vapour pressures at 20 and 25 °C were calculated from the linear regression equation to be 3.90E-3 and 5.04E-3 Pa, respectively.