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EC number: 848-536-1 | CAS number: 28911-49-1
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- from 2020-02-26 to 2020-02-28
- 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
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- 2008
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- dynamic method
- Key result
- Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- 0.025 Pa
- Key result
- Test no.:
- #2
- Temp.:
- 25 °C
- Vapour pressure:
- 0.036 Pa
- Conclusions:
- The estimated vapour pressure of the test item at 20 °C is 2.5e-2 Pa.
- Executive summary:
The vapour pressure of test item has been determined according to the effusion method described in OECD Guideline n. 104 (2006) and EU Regulation No 440/2008, Method A.4. Therefore, the test item is set under vacuum to ensure it is dry and degased before the actual test starts. The sample of the test item is then heated in a small furnace, placed in an evacuated bell jar. The furnace is covered by a lid with small holes of known diameters. The vapour of the substance, escaping through one of the holes, is directed onto a balance pan of a highly sensitive balance which is also enclosed in the evacuated bell jar. The time dependent increase of weight on the balance is defined as the evaporation rate. The vapour pressure can be derived from the evaporation rate using the Hertz-Knudsen equation.The vapour pressure of the test item was determined at seven different temperatures. The logarithm of the vapour pressure was plotted as a function if the inverse temperature 1/T. The vapour pressure at 20, 25 and 50 °C was calculated from the linear regression to be 2.5e-2, 3.6e-2 and 2.0e-1 Pa, respectively.
Reference
The vapour pressure was measured in the temperature range of 27 to 58 °C.
No. |
Temperature / °C |
Vapour pressure / Pa |
1 |
27 |
4.71 ×10-2 |
2 |
33 |
6.56 ×10-2 |
3 |
37 |
7.47 ×10-2 |
4 |
42 |
1.07 ×10-1 |
5 |
47 |
1.68 ×10-1 |
6 |
52 |
2.36 ×10-1 |
7 |
58 |
3.41 ×10-1 |
The logarithm of the vapour pressure was plotted as a function if the inverse temperature 1/T. From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation (log p = A + B/T) can be derived by regression of the data points to A = 8.1146 and B = -2848.56. Tha vapour pressure of the test item at 20, 25 and 50 °C was calculated by extra- and interpolation.
Temperature / °C |
Vapour pressure / Pa |
20 |
2.5 ×10-2 |
25 |
3.6 ×10-2 |
50 |
2.0 ×10-1 |
Description of key information
The estimated vapour pressure of the test item at 20 °C is 2.5e-2 Pa.
Key value for chemical safety assessment
- Vapour pressure:
- 0.025 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 n. 104 (2006) and EU Regulation No 440/2008, Method A.4. Therefore, the test item is set under vacuum to ensure it is dry and degased before the actual test starts. The sample of the test item is then heated in a small furnace, placed in an evacuated bell jar. The furnace is covered by a lid with small holes of known diameters. The vapour of the substance, escaping through one of the holes, is directed onto a balance pan of a highly sensitive balance which is also enclosed in the evacuated bell jar. The time dependent increase of weight on the balance is defined as the evaporation rate. The vapour pressure can be derived from the evaporation rate using the Hertz-Knudsen equation.The vapour pressure of the test item was determined at seven different temperatures. The logarithm of the vapour pressure was plotted as a function if the inverse temperature 1/T. The vapour pressure at 20, 25 and 50 °C was calculated from the linear regression to be 2.5e-2, 3.6e-2 and 2.0e-1 Pa, respectively.
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