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Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 29 Jul - 15 Aug 2016
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- GLP guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 016
- Report date:
- 2016
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- adopted in 2008
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Version / remarks:
- adopted in 2006
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Department of Health, London, UK
- Type of method:
- effusion method: vapour pressure balance
Test material
Constituent 1
- Specific details on test material used for the study:
- Storage conditions: room temperature in the dark
Results and discussion
Vapour pressure
- Key result
- Temp.:
- ca. 25 °C
- Vapour pressure:
- ca. 0 hPa
- Remarks on result:
- other:
- Remarks:
- estimated from vapour pressure curve
Transition / decomposition
- Key result
- Transition / decomposition:
- no
- Remarks:
- The test item did not change in appearance under the conditions used in the determination
Any other information on results incl. tables
Results
Recorded temperatures, mass differences and the resulting calculated values of vapor pressure are shown in the following tables.
Run 7
Table 1 – Vapor Pressure Data
Temperature [°C] |
Temperature [K] |
Reciprocal Temperature [K-1] |
Mass Difference [μg] |
Mass Difference [kg] |
Vapor Pressure [Pa] |
Log10Vp |
20 |
293.15 |
0.003411223 |
1.99 |
1.990E-09 |
0.002762630 |
-2.558677302 |
21 |
294.15 |
0.003399626 |
2.44 |
2.440E-09 |
0.003387345 |
-2.470140552 |
22 |
295.15 |
0.003388108 |
3.14 |
3.140E-09 |
0.004359124 |
-2.360600731 |
23 |
296.15 |
0.003376667 |
2.23 |
2.230E-09 |
0.003095811 |
-2.509225516 |
24 |
297.15 |
0.003365304 |
2.15 |
2.150E-09 |
0.002984751 |
-2.525091919 |
25 |
298.15 |
0.003354016 |
2.52 |
2.520E-09 |
0.003498406 |
-2.456129838 |
26 |
299.15 |
0.003342805 |
3.15 |
3.150E-09 |
0.004373007 |
-2.359219825 |
27 |
300.15 |
0.003331667 |
3.63 |
3.630E-09 |
0.005039370 |
-2.297623754 |
28 |
301.15 |
0.003320604 |
3.90 |
3.900E-09 |
0.005414199 |
-2.266465772 |
29 |
302.15 |
0.003309614 |
3.69 |
3.690E-09 |
0.005122665 |
-2.290504013 |
30 |
303.15 |
0.003298697 |
3.80 |
3.800E-09 |
0.005275374 |
-2.277746782 |
No statistical analysis is given due to the nature of the plot.
Run 8
Table 2 – Vapor Pressure Data
Temperature [°C] |
Temperature [K] |
Reciprocal Temperature [K-1] |
Mass Difference [μg] |
Mass Difference [kg] |
Vapor Pressure [Pa] |
Log10Vp |
20 |
293.15 |
0.003411223 |
1.47 |
1.470E-09 |
0.002040737 |
-2.690213044 |
21 |
294.15 |
0.003399626 |
1.74 |
1.740E-09 |
0.002415566 |
-2.616981130 |
22 |
295.15 |
0.003388108 |
1.01 |
1.010E-09 |
0.001402139 |
-2.853209005 |
23 |
296.15 |
0.003376667 |
2.41 |
2.410E-09 |
0.003345697 |
-2.475513336 |
24 |
297.15 |
0.003365304 |
2.41 |
2.410E-09 |
0.003345697 |
-2.475513336 |
25 |
298.15 |
0.003354016 |
2.30 |
2.300E-09 |
0.003192989 |
-2.495802543 |
26 |
299.15 |
0.003342805 |
2.40 |
2.400E-09 |
0.003331815 |
-2.477319137 |
27 |
300.15 |
0.003331667 |
2.92 |
2.920E-09 |
0.004053708 |
-2.392147527 |
28 |
301.15 |
0.003320604 |
2.90 |
2.900E-09 |
0.004025943 |
-2.395132381 |
29 |
302.15 |
0.003309614 |
2.74 |
2.740E-09 |
0.003803822 |
-2.419779816 |
30 |
303.15 |
0.003298697 |
2.83 |
2.830E-09 |
0.003928765 |
-2.405743943 |
No statistical analysis is given due to the nature of the plot.
Run 9
Table 3 – Vapor Pressure Data
Temperature [°C] |
Temperature [K] |
Reciprocal Temperature [K-1] |
Mass Difference [μg] |
Mass Difference [kg] |
Vapor Pressure [Pa] |
Log10Vp |
20 |
293.15 |
0.003411223 |
1.78 |
1.780E-09 |
0.002471096 |
-2.607110376 |
21 |
294.15 |
0.003399626 |
1.57 |
1.570E-09 |
0.002179562 |
-2.661630726 |
22 |
295.15 |
0.003388108 |
1.19 |
1.190E-09 |
0.001652025 |
-2.781983417 |
23 |
296.15 |
0.003376667 |
1.06 |
1.060E-09 |
0.001471552 |
-2.832224513 |
24 |
297.15 |
0.003365304 |
1.81 |
1.810E-09 |
0.002512744 |
-2.599851804 |
25 |
298.15 |
0.003354016 |
2.08 |
2.080E-09 |
0.002887573 |
-2.539467044 |
26 |
299.15 |
0.003342805 |
2.69 |
2.690E-09 |
0.003734409 |
-2.427778099 |
27 |
300.15 |
0.003331667 |
2.50 |
2.500E-09 |
0.003470640 |
-2.459590370 |
28 |
301.15 |
0.003320604 |
2.04 |
2.040E-09 |
0.002832043 |
-2.547900211 |
29 |
302.15 |
0.003309614 |
2.06 |
2.060E-09 |
0.002859808 |
-2.543663158 |
30 |
303.15 |
0.003298697 |
2.03 |
2.030E-09 |
0.002818160 |
-2.550034341 |
No statistical analysis is given due to the nature of the plot.
Run 10
Table 4 – Vapor Pressure Data
Temperature [°C] |
Temperature [K] |
Reciprocal Temperature [K-1] |
Mass Difference [μg] |
Mass Difference [kg] |
Vapor Pressure [Pa] |
Log10Vp |
20 |
293.15 |
0.003411223 |
1.84 |
1.840E-09 |
0.002554391 |
-2.592712556 |
21 |
294.15 |
0.003399626 |
1.58 |
1.580E-09 |
0.002193445 |
-2.658873292 |
22 |
295.15 |
0.003388108 |
2.37 |
2.370E-09 |
0.003290167 |
-2.482782033 |
23 |
296.15 |
0.003376667 |
1.29 |
1.290E-09 |
0.001790850 |
-2.746940668 |
24 |
297.15 |
0.003365304 |
1.41 |
1.410E-09 |
0.001957441 |
-2.708311266 |
25 |
298.15 |
0.003354016 |
1.49 |
1.490E-09 |
0.002068502 |
-2.684344110 |
26 |
299.15 |
0.003342805 |
1.33 |
1.330E-09 |
0.001846381 |
-2.733678738 |
27 |
300.15 |
0.003331667 |
1.86 |
1.860E-09 |
0.002582157 |
-2.588017435 |
28 |
301.15 |
0.003320604 |
2.12 |
2.120E-09 |
0.002943103 |
-2.531194518 |
29 |
302.15 |
0.003309614 |
1.66 |
1.660E-09 |
0.002304505 |
-2.637422291 |
30 |
303.15 |
0.003298697 |
1.77 |
1.770E-09 |
0.002457213 |
-2.609557112 |
No statistical analysis is given due to the nature of the plot.
Discussion
The test item did not change in appearance under the conditions used in the determination.
The results may represent rounded-off values obtained by calculations based on the exact raw data.
No statistical analyses were performed because the balance readings were too low and variable for a line of best fit to have any meaning. Instead it was considered more appropriate to impose a regression slope on a chosen data point to provide an estimate of the maximum value for the vapor pressure at 25 °C.
Run 10 was chosen because the sample had been under vacuum for the longest period prior to this run and so degassing would have been the most complete. The reading at 22 °C (295 K) was chosen because this is the data point which gives the highest estimated vapor pressure at any given temperature when a slope of –1500 K is imposed upon it.
The value of –1500 K is an in-house value and is the shallowest slope observed whilst determining the vapor pressure on a wide range of samples using the vapor pressure balance method. Extrapolation to 25 °C gave a vapor pressure of 3.70E-03 Pa which has been taken as a maximum for this material.
Conclusion
The vapor pressure of the test item has been determined to be less than 3.7E-03 Pa at 25 °C.
Applicant's summary and conclusion
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