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EC number: 947-940-6 | 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:
- 17 August 2016 - 25 October 2016
- 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:
- 23. March 2006
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- 24 August 2009
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Version / remarks:
- August 1996
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: Knudsen cell
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: calculated from the regression equation
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
- Remarks on result:
- other: calculated from the regression equation
- Conclusions:
- The vapour pressure of the test item was calculated to be 1.24E-5 Pa at 20°C and 1.78E-5 Pa at 25°C, respectively.
- Executive summary:
A study was conducted according to OECD TG 104, EU method A.4 and EPA OPPTS 830.7950 to determine the vapour pressure of the test item at nine different temperatures (30, 45, 60, 75, 90, 105, 120, 135 and 150°C) using the effusion method (Knudsen cell). Experiment 1 - 6 (nominal temperature 30- 105 °C) yielded no relevant or reproducible weight loss. Three experiments could be evaluated as they showed relevant and reproducible weight loss. All evaluated experiments showed good reproducibility, giving relative standard deviations of less than 5 % and very good correlation. Therefore, the result of the test can be considered valid. The vapour pressure of the test item was calculated to be 1.24E-5 Pa at 20°C and 1.78E-5 Pa at 25°C, respectively.
Reference
The measured values for temperature and vapour pressure were evaluated as follows:
| Parameter | T | Mean P | 1/T | Log P |
| Unit | K | Pa | 1/K | Log Pa |
| Value | 393.2 | 2.98E-03 | 2.5432E-03 | -2.5251 |
| 408.2 | 5.52E-03 | 2.4498E-03 | -2.2581 | |
| 423.2 | 9.33E-03 | 2.3629E-03 | -2.0299 |
The graph with log P vs. 1/T was plotted. Since the values were correlated by a linear relation, the data could be fitted by linear regression.
| Parameter | Value |
| Slope | -2748.0 |
| Intercept | 4.4671 |
| Correlation Coefficient r | -0.9997 |
| Coefficient of Determination r2 | 0.9994 |
The following vapour pressures were determined experimentally and considered as valid (mean and standard deviation given):
| T | T | Mean P | Stand.Dev.P | RSD P |
| °C | K | Pa | Pa | % |
| 120°C | 393.2 | 2.98E-03 | 7.39E-05 | 2.5% |
| 135°C | 408.2 | 5.52E-03 | 2.57E-04 | 4.7% |
| 150°C | 423.2 | 9.33E-03 | 3.97E-04 | 4.3% |
In this table, E-0X represents multiplication with 10-x. Stand. Dev. = Standard Deviation; RSD = Relative Standard Deviation
Description of key information
The vapour pressure of the test item was calculated to be 1.24E-5 Pa at 20 °C and 1.78E-5 Pa at 25 °C, respectively.
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 20 °C
Additional information
A study was conducted according to OECD TG 104, EU method A.4 and EPA OPPTS 830.7950 to determine the vapour pressure of the test item at nine different temperatures (30, 45, 60, 75, 90, 105, 120, 135 and 150°C) using the effusion method (Knudsen cell). Experiment 1 - 6 (nominal temperature 30- 105 °C) yielded no relevant or reproducible weight loss. Three experiments could be evaluated as they showed relevant and reproducible weight loss. All evaluated experiments showed good reproducibility, giving relative standard deviations of less than 5 % and very good correlation. Therefore, the result of the test can be considered valid. The vapour pressure of the test item was calculated to be 1.24E-5 Pa at 20 °C and 1.78E-5 Pa at 25 °C, respectively.
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