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EC number: 947-394-9 | CAS number: -
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:
- 25th-26th May 1994
- 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:
- Commission Directive 92/69/EEC
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: vapour pressure balance
- Test no.:
- #1
- Temp.:
- 25 °C
- Vapour pressure:
- 0 hPa
- Remarks on result:
- other:
- Remarks:
- Calculated from plot of Log (vapour pressure) vs Reciprocal temperature
- Test no.:
- #2
- Temp.:
- 25 °C
- Vapour pressure:
- 0 hPa
- Remarks on result:
- other:
- Remarks:
- Calculated from plot of Log (vapour pressure) vs Reciprocal temperature
- Key result
- Test no.:
- #3
- Temp.:
- 25 °C
- Vapour pressure:
- 0 hPa
- Remarks on result:
- other:
- Remarks:
- Calculated from plot of Log (vapour pressure) vs Reciprocal temperature
- Conclusions:
- The vapour pressure of the test item at 25 °C was calculated to be 9.4E-04 Pa.
- Executive summary:
The vapour pressure of the test item was determined using a vapour pressure balance as described in Method A.4 of Commission Directive 92/69/EEC. The vapour pressure of the test item at 25 °C was calculated to be 9.4E-04 Pa, based on extrapolation of the Log (Vapour pressure) vs 1/Temperature plot from the sample subjected to the most degassing.
Reference
For Run 1 during pumpdown, there was some initial degassing of the sample. Run 2 was performed after overnight pumping and recooling. Run 3 was performed after a further overnight pumping and recooling.
Run 1
Temperature (K) |
Reciprocal Temperature (1/K) |
Mass Difference (Kg) |
Vapour Pressure (Pa) |
Log Vp |
2.9425E+02 |
3.3985E-03 |
1.000E-09 |
1.3001E-03 |
-2.8860 |
2.9775E+02 |
3.3585E-03 |
1.140E-09 |
1.4822E-03 |
-2.8291 |
3.0390E+02 |
3.2906E-03 |
1.540E-09 |
2.0022E-03 |
-2.6985 |
3.0955E+02 |
3.2305E-03 |
2.240E-09 |
2.9123E-03 |
-2.5358 |
3.1450E+02 |
3.1797E-03 |
3.160E-09 |
4.1084E-03 |
-2.3863 |
3.1925E+02 |
3.1323E-03 |
6.000E-09 |
7.8808E-03 |
-2.1079 |
3.2325E+02 |
3.0936E-03 |
1.000E-08 |
1.3001E-02 |
-1.8860 |
3.2315E+02 |
3.0945E-03 |
1.770E-08 |
2.3012E-02 |
-1.6380 |
A plot of Log(vapour pressure) vs Reciprocal temperature gave a slope of -3664.755 and an intercept of 9.438.
The results obtained indicate the following vapour pressure relationship.
Log Vp (Pa) = -3664.755/Temp (K) + 9.438
Based on this equation, the Vapour pressure at 289.15K (25 °C) = 1.400E-03 Pa.
Run 2
Temperature (K) |
Reciprocal Temperature (1/K) |
Mass Difference (Kg) |
Vapour Pressure (Pa) |
Log Vp |
2.9440E+02 |
3.3967E-03 |
4.400E-10 |
5.7206E-04 |
-3.2426 |
2.9865E+02 |
3.3484E-03 |
5.400E-10 |
7.0207E-04 |
-3.1536 |
3.0390E+02 |
3.2906E-03 |
7.000E-10 |
9.1009E-04 |
-3.0409 |
3.0955E+02 |
3.2305E-03 |
9.400E-10 |
1.2221E-03 |
-2.9129 |
3.1450E+02 |
3.1797E-03 |
1.400E-09 |
1.8202E-03 |
-2.7399 |
3.1945E+02 |
3.1304E-03 |
2.000E-09 |
2.6003E-03 |
-2.5850 |
3.2345E+02 |
3.0917E-03 |
2.880E-09 |
3.7444E-03 |
-2.4266 |
3.2565E+02 |
3.0708E-03 |
5.060E-09 |
6.5787E-03 |
-2.1819 |
3.3140E+02 |
3.0175E-03 |
9.600E-09 |
1.2481E-02 |
-1.9037 |
3.3150E+02 |
3.0166E-03 |
1.130E-08 |
1.4692E-02 |
-1.8329 |
A plot of Log(vapour pressure) vs Reciprocal temperature gave a slope of -3612.451 and an intercept of 8.876.
The results obtained indicate the following vapour pressure relationship.
Log Vp (Pa) = -3612.451/Temp (K) + 8.876
Based on this equation, the Vapour pressure at 289.15K (25 °C) = 5.748E-04 Pa.
Run 3
Temperature (K) |
Reciprocal Temperature (1/K) |
Mass Difference (Kg) |
Vapour Pressure (Pa) |
Log Vp |
2.9615E+02 |
3.3767E-03 |
7.000E-10 |
9.1009E-04 |
-3.0409 |
3.0125E+02 |
3.3195E-03 |
1.060E-09 |
1.3781E-03 |
-2.8607 |
3.0825E+02 |
3.2441E-03 |
1.000E-09 |
1.3001E-03 |
-2.8860 |
3.1225E+02 |
3.2026E-03 |
1.500E-09 |
1.9502E-03 |
-2.7099 |
3.1750E+02 |
3.1496E-03 |
2.000E-09 |
2.6003E-03 |
-2.5850 |
3.2005E+02 |
3.1245E-03 |
2.820E-09 |
3.6664E-03 |
-2.4358 |
3.2405E+02 |
3.0859E-03 |
3.700E-09 |
4.8105E-03 |
-2.3178 |
3.2765E+02 |
3.0520E-03 |
4.100E-09 |
5.3306E-03 |
-2.2732 |
3.3225E+02 |
3.0098E-03 |
5.020E-09 |
6.5267E-03 |
-1.1853 |
3.3750E+02 |
2.9630E-03 |
6.600E-09 |
8.5809E-03 |
-1.0665 |
A plot of Log(vapour pressure) vs Reciprocal temperature gave a slope of -2431.748 and an intercept of 5.134.
The results obtained indicate the following vapour pressure relationship.
Log Vp (Pa) = -2431.748/Temp (K) + 5,134
Based on this equation, the Vapour pressure at 289.15K (25 °C) = 9.426E-04 Pa.
The value from Run 3 was chosen to be the best estimate of vapour pressure since it was the most degassed sample.
Description of key information
The vapour pressure of the test item at 25 °C is 9.4E-04 Pa.
Key value for chemical safety assessment
- Vapour pressure:
- 0 hPa
- at the temperature of:
- 25 °C
Additional information
The vapour pressure of the test item was determined using a vapour pressure balance as described in Method A.4 of Commission Directive 92/69/EEC. The vapour pressure of the test item at 25 °C was calculated to be 9.4E-04 Pa, based on extrapolation of the Log (Vapour pressure) vs 1/Temperature plot from the sample subjected to the most degassing.
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