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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:
25 May - 12 Oct 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
GLP guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
adopted in 2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
adopted in 2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
Landesamt für Umwelt, Wasserwirtschaft und Gewerbeaufsicht, Mainz, Germany
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
Storage: room temperature (20 ± 5 °C), keep away from light
Temp.:
20 °C
Vapour pressure:
0 hPa
Remarks on result:
other:
Remarks:
Esimated from the vapour pressure curve by regression.
Temp.:
25 °C
Vapour pressure:
0 hPa
Remarks on result:
other:
Remarks:
Estimated from the vapour pressure curve by regression.

Table 2 – Experimentally determined vapour pressure values

T [°C]

P [Pa]

Standard deviation (population) [Pa]

Relative standard deviation (population) [%]

26.9

2.68E-04

5.22E-05

19.5

41.0

3.94E-04

1.78E-04

45.1

55.1

4.90E-04

2.53E-04

51.7

 

The following test item vapour pressures were calculated from the regression equation:
Vapour pressure at 20 °C: 2.32E-04 Pa
Vapour pressure at 25 °C: 2.62E-04 Pa

Discussion
Study plan deviations
The first experiment was initiated at 90 °C instead of at 30 °C because the measurements should start as quickly as possible.

  

Description of key information

2.32E-06 hPa at 20 °C
2.62E-06 hPa at 25 °C

(OECD 104, calculated using regression equation)

Key value for chemical safety assessment

Vapour pressure:
0 hPa
at the temperature of:
25 °C

Additional information

Vapour pressure values were calculated using a linear regression equation.