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EC number: 247-196-6 | CAS number: 25707-70-4
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:
- 2021-06-03
- 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:
- 2009
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: Knudsen cell
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 1.318 Pa
- Temp.:
- 20 °C
- Vapour pressure:
- 0.967 Pa
- Vapour pressure:
- 0.022 Pa
- Conclusions:
- The vapour pressure of the test item was determined to be 1.318 Pa at 25 °C.
- Executive summary:
An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC) No. 440/2008 Method A.4. and OECD Test Guideline 104 (2006) using the effusion method (Knudsen cell). The vapour pressure at 20 and 25 °C was extrapolated from the linear regression of the vapour pressure curve of the measurements performed in the range of 30 to 60 °C. The vapour pressure of the test item was determined to be 0.967 Pa and 1.318 Pa at 20 and 25 °C, respectively.
Reference
The vapour pressure was measured in the temperature range of 30 to 60 °C. As no reproducible mass loss was achieved at 30 °C, the evaluation of the vapour pressure was performed in the range of 35 to 60 °C. The measured vapour pressure values together with the measured temperatures and the regression data of the vapour pressure curve can be seen in Tables 1 and 2, respectively.
Table 1. Results of the Effusion method
Temperature, °C | Δm/Δt, mg/min | Vapour pressure, Pa |
35.1 | 1.2991 x 10-2 | 2.7457 |
40.0 | 1.4707 x 10-2 | 3.1333 |
45.1 | 1.6330 x 10-2 | 3.5070 |
50.1 | 2.2191 x 10-2 | 4.8031 |
55.1 | 3.3167 x 10-2 | 7.2336 |
60.1 | 4.5380 x 10-2 | 9.9729 |
Table 2. Regression data of the vapour pressure curve - Regression output
Intercept | Slope | R. Squared |
8.0021 | -2350.0733 | 0.9417 |
Description of key information
The vapour pressure of the test item was determined to be 1.318 Pa at 25 °C.
Key value for chemical safety assessment
- Vapour pressure:
- 1.318 Pa
- at the temperature of:
- 25 °C
Additional information
An experimental study was conducted to determine the vapour pressure of the test item according to Regulation (EC) No. 440/2008 Method A.4. and OECD Test Guideline 104 (2006) using the effusion method (Knudsen cell). The vapour pressure at 20 and 25 °C was extrapolated from the linear regression of the vapour pressure curve of the measurements performed in the range of 30 to 60 °C. The vapour pressure of the test item was determined to be 0.967 Pa and 1.318 Pa at 20 and 25 °C, respectively.
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