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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:
16-09-2013 to 18-10-2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study performed under GLP. All relevant validity criteria were met.
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes
Type of method:
effusion method: isothermal thermogravimetry
Temp.:
20 °C
Vapour pressure:
0.98 Pa
Temp.:
25 °C
Vapour pressure:
1.7 Pa

The results of the isothermal TGA analysis for the test item and the vapour pressure at 20°C and 25°C are given in the following tables.

 

Table 2 Results of the isothermal TGA analysis

Temperature

[°C]

Weight loss

[µg/min]

νT

[g/cm2/h]

log νT

log PT

PT

[Pa]

40

4.471

5.34 × 10^-4

-3.27

0.87

7.5

 

4.440

5.30 × 10^-4

-3.28

0.87

7.4

50

11.79

1.41 × 10^-3

-2.85

1.32

2.1 × 10^1

 

12.23

1.46 × 10^-3

-2.84

1.33

2.2 × 10^1

60

27.01

3.22 × 10^-3

-2.49

1.70

5.0 × 10^1

 

26.72

3.19 × 10^-3

-2.50

1.69

4.9 × 10^1

70

56.71

6.77 × 10^-3

-2.17

2.03

1.1 × 10^2

 

55.27

6.60 × 10^-3

-2.18

2.02

1.1 × 10^2

 

Table 2 Vapour pressure of the test item

Temperature

[°C]

log PT

PT

[Pa]

PT

[mm Hg]

20 

-0.01

0.98

7.4 × 10^-3 

25

0.23

1.7

1.3 × 10^-2

 

The plot of the log PT of the test item as function of the reciprocal temperatures was performed. The equation of the curve was: log PT,20 = -4129 × 1/T + 14.08 (r = 0.998, n = 8).

Conclusions:
The vapour pressure of the test item was determined to be 0.98 Pa at 20°C (293K) and 1.70 Pa at 25°C (298K), respectively.
Executive summary:

The vapour pressure was determined using the thermogravimetric effusion method in OECD TG 104, EU Method A.4 and US EPA OPPTS 830.7950 under GLP. The vapour pressure of the test item was determined, in duplicate to be respectively: 20°C: 0.98 Pa (or 7.4 x 10^-3 mm Hg) and 25°C: 1.70 Pa (or 1.3 x 10^-3 mm Hg).

Description of key information

Vapour Pressure: 0.98 Pa at 20°C and 1.70 Pa at 25°C, OECD TG 104 - thermogravimetric effusion method, 2014

Key value for chemical safety assessment

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

Additional information

Key study : OECD TG 104, 2014 : The vapour pressure was determined using the thermogravimetric effusion method in OECD TG 104, EU Method A.4 and US EPA OPPTS 830.7950 under GLP. The vapour pressure of the test item was determined, in duplicate to be respectively: 20°C: 0.98 Pa (or 7.4 x 10^-3 mm Hg) and 25°C: 1.70 Pa (or 1.3 x 10^-3 mm Hg).

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