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EC number: 211-581-7 | CAS number: 670-96-2
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 14 - 21 December 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 018
- Report date:
- 2018
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- 2008
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- 2006
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Ministery of Health, Italy
- Type of method:
- effusion method: Knudsen cell
Test material
- Reference substance name:
- 2-phenylimidazole
- EC Number:
- 211-581-7
- EC Name:
- 2-phenylimidazole
- Cas Number:
- 670-96-2
- Molecular formula:
- C9H8N2
- IUPAC Name:
- 2-phenyl-1H-imidazole
- Test material form:
- solid: flakes
Constituent 1
Results and discussion
Vapour pressure
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.009 Pa
Any other information on results incl. tables
Results of the analysis
The result of the thermogravimetric analysis for test item and the vapour pressure at 20 °C are given in the following table.
T [°C] |
Δm [mg] |
Δt [min] |
T [K] |
1/T [1/K] |
Δm/Δt [kg/s] |
Vapour pressure [Pa] |
log p |
33.5 |
0.0366 |
80 |
306.65 |
3.26E-03 |
7.63E-12 |
6.08E-02 |
-1.2160 |
39.6 |
0.0705 |
80 |
312.75 |
3.20E-03 |
1.47E-11 |
1.18E-01 |
-0.9270 |
46.1 |
0.1085 |
80 |
319.35 |
3.13E-03 |
2.26E-11 |
1.84E-01 |
-0.7353 |
52.9 |
0.1592 |
80 |
326.05 |
3.07E-03 |
3.32E-11 |
2.73E-01 |
-0.5642 |
60.0 |
0.2544 |
80 |
333.15 |
3.00E-03 |
5.30E-11 |
4.41E-01 |
-0.3560 |
67.4 |
0.4844 |
80 |
340.35 |
2.94E-03 |
1.01E-10 |
8.48E-01 |
-0.0715 |
75.1 |
1.0051 |
80 |
348.25 |
2.78E-03 |
2.09E-10 |
1.78E+00 |
0.2503 |
81.9 |
2.0799 |
80 |
355.05 |
2.82E-03 |
4.33E-10 |
3.72E+00 |
0.5704 |
39.5 |
0.0281 |
80 |
312.65 |
3.20E-03 |
5.85E-12 |
4.71E-02 |
-1.3266 |
45.8 |
0.0572 |
80 |
318.95 |
3.14E-03 |
1.19E-11 |
9.69E-02 |
-1.0135 |
52.3 |
0.1181 |
80 |
325.45 |
3.07E-03 |
2.46E-11 |
2.02E-01 |
-0.6943 |
| 59.3 | 0.2088 | 80 | 332.45 | 3.01E-03 | 4.35E-11 | 3.61E-01 | -0.4422 |
| 66.5 | 0.4532 | 80 | 339.65 | 2.94E-03 | 9.44E-11 | 7.93E-01 | -0.1010 |
| 73 .6 | 0.9832 | 80 | 346.75 | 2.88E-03 | 2.05E-10 | 1.74E+00 | 0.2398 |
| 81.3 | 2.1148 | 80 | 354.45 | 2.82E-03 | 4.41E-10 | 3.78 E+00 | 0.5772 |
Since the analysis was conducted under high vacuum conditions, the heat could be transferred only by radiation, this caused a consistent difference between the furnace temperature and the sample one and a considerable time for the system to reach equilibrium.
The temperatures reported (registered by the thermocouple under the Knudsen cell) are hence different from the one set and the mass loss has been measured only in 80 minutes time interval within each isotherm, after the system had reached equilibrium.
Determination of the vapour pressure curve
y = mx + q |
Parameter m (slope) |
Parameter q (intercept) |
Parameter R² (correlation) |
-4230 |
12 |
0.96276 |
Extrapolation of the vapour pressure at 20 °C
Extrapolation at 20°C |
1/Temperature [1/K] |
log p |
Vapour pressure [Pa] |
0.00341 |
-2.0289 |
9.36 x 10-3 |
Applicant's summary and conclusion
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