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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:
11.06. - 21.08.15
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: Knudsen cell
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 hPa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0 hPa
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0 hPa

The vapour pressure was measured in a temperature range 65-125 °C. The measured vapour pressures at the corresponding temperatures are listed below:

 

Temperature / °C

Vapour pressure / hPa

65

7.5 x 10E-5

75

3.0 x 10E-5

85

3.2 x 10E-5

95

7.7 x 10E-5

105

2.2 x 10E-4

115

6.1 x 10E-4

125

1.5 x 10E-3

 

The data points measured at 65 and 75 °C were not included in the linear regression because they show a typical deviation caused by volatile impurities at the beginning of a measurement. The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C.

 

The following vapour pressure values for the test item were extrapolated from the experimental data

 

20 °C:  5.3 x 10E-7 Pa

25 °C:  1.2 x 10E-6 Pa

50 °C:  4.3 x 10E-5 Pa

Conclusions:
The vapour pressure of the test item was determined to be 1.2x10 -8 hPa at 25°C.
Executive summary:

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined in the temperature range 65-125 °C. The data points measured at 65 and 75 °C were not included in the linear regression because they show a typical deviation caused by volatile impurities at the beginning of a measurement. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C. The vapour pressure was calculated to be 5.3 x 10E-7 Pa at 20 °C and 1.2 x 10E-6 Pa at 25 °C and 4.3 x 10E-5 Pa at 50 °C respectively.

Description of key information

The vapour pressure of the test item was determined to be 1.2x10 -8 hPa at 25°C (reference 4.6 -1)

Key value for chemical safety assessment

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

Additional information

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item (reference 4.6 -1). The vapour pressure of the test item was determined in the temperature range 65-125 °C. The data points measured at 65 and 75 °C were not included in the linear regression because they show a typical deviation caused by volatile impurities at the beginning of a measurement. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C. The vapour pressure was calculated to be 5.3 x 10E-7 Pa at 20 °C and 1.2 x 10E-6 Pa at 25 °C and 4.3 x 10E-5 Pa at 50 °C respectively.