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EC number: 844-232-8 | CAS number: 102731-54-4
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:
- from 2020-01-20 to 2020-01-21
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- 2009
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- 2006
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: Knudsen cell
- Key result
- Test no.:
- #1
- Temp.:
- 20 °C
- Vapour pressure:
- 0.071 Pa
- Key result
- Test no.:
- #2
- Temp.:
- 25 °C
- Vapour pressure:
- 0.108 Pa
- Conclusions:
- The estimated vapour pressure of the test item at 20 °C is 7.136e-2 Pa.
- Executive summary:
The vapour pressure of the test item was determined according to Regulation (EC) No. 440/2008 Method A.4. Vapour pressure and OECD Test Guideline 104 (2006). The method is based on the estimation of the mass of test item flowing out per unit of time of a Knudsen cell in the form of vapour, through a micro-orifice under ultra-vacuum conditions. The mass of effused vapour was obtained by determining the loss of mass of the cell. The vapour pressure was calculated by applying the Hertz-Knudsen relation. The vapour pressure of the test item was determined at different temperatures. The vapour pressures at 20 and 25 °C were calculated from the linear regression equation to be 7.136e-2 and 1.078e-1 Pa, respectively.
Reference
The vapour pressure was measured in the temperature range of 30 to 60 °C. For the evaluation, the vapour pressure values in the range of 30 to 60 °C were used. |
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Results of the Effusion method |
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Δm/Δt, mg/min |
Vapour pressure, Pa |
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9.5238 x 10-4 |
2.0035 x 10-1 |
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|
1.0096 x 10-3 |
2.1413 x 10-1 |
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|
1.4053 x 10-3 |
3.0046 x 10-1 |
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|
- * |
- |
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|
2.7319 x 10-3 |
5.9338 x 10-1 |
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|
4.4272 x 10-3 |
9.6898 x 10-1 |
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|
7.5299 x 10-3 |
1.6607 |
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* measurement error was observed at 45 °C, therefore not used for the calculations |
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Regression data of the vapour pressure curve - Regression output |
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|
Slope |
R. Squared |
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|
-3130.9733 |
0.9620 |
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Description of key information
The estimated vapour pressure of the test item at 20 °C is 7.136e-2 Pa.
Key value for chemical safety assessment
- Vapour pressure:
- 0.071 Pa
- at the temperature of:
- 20 °C
Additional information
The vapour pressure of the test item was determined according to Regulation (EC) No. 440/2008 Method A.4. Vapour pressure and OECD Test Guideline 104 (2006). The method is based on the estimation of the mass of test item flowing out per unit of time of a Knudsen cell in the form of vapour, through a micro-orifice under ultra-vacuum conditions. The mass of effused vapour was obtained by determining the loss of mass of the cell. The vapour pressure was calculated by applying the Hertz-Knudsen relation. The vapour pressure of the test item was determined at different temperatures. The vapour pressures at 20 and 25 °C were calculated from the linear regression equation to be 7.136e-2 and 1.078e-1 Pa, respectively.
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