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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:
07.07.2016 - 07.09.2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Temp.:
25 °C
Vapour pressure:
0 Pa
Temp.:
50 °C
Vapour pressure:
0 Pa

The data point measured at 70 °C was not included in the linear regression because it showed a typical deviation caused by volatile impurities at the beginning of a measurement. The data points measured between 80 °C and 90 °C were not included in the linear regression because the mass loss at these temperatures was below the detection limit.

The values for 20, 25 and 50 °C were calculated, using the Antoine constants A, B and C.

Table 2: Antoine parameters and extrapolated vapour pressures

T/°C

log (p/hPa) = A + B/(C + T[°C])

p/hPa

p/Pa

20

A = 10.80591

3.4E-10

3.4E-8

25

B = -5942.29

7.5E-10

7.5E-8

50

C = 273.15

2.6E-8

2.6E-6

Conclusions:
The vapour pressure of the test substance was determined to be 3.4E-8 Pa at 20 °C, 7.5E-8 at 25 °C and 2.6E-6 at 50 °C, respectively.
Executive summary:

A study was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure was measured in the temperature range of 70 °C to 120 °C using the effusion method. Above 90 °C determinable mass loss was measered and thus the vapour pressure could be determined. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure of the test substance was determined to be 3.4E-8 Pa at 20 °C, 7.5E-8 at 25 °C and 2.6E-6 at 50 °C, respectively.

Description of key information

The vapour pressure of the test substance was determined to be 3.4E-8 Pa at 20 °C, 7.5E-8 at 25 °C and 2.6E-6 at 50 °C, respectively.

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 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure was measured in the temperature range of 70 °C to 120 °C using the effusion method. Above 90 °C determinable mass loss was measered and thus the vapour pressure could be determined. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure of the test substance was determined to be 3.4E-8 Pa at 20 °C, 7.5E-8 at 25 °C and 2.6E-6 at 50 °C, respectively (reference 4.6-1).