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EC number: 210-638-3 | CAS number: 620-40-6
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:
- 2020-05-18
- 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:
- 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)
- Type of method:
- effusion method: Knudsen cell
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Conclusions:
- The vapour pressure of the test item was found to be 6.4 x 10-5 Pa at 25 °C.
- Executive summary:
The vapour pressure of the test item was determined using the Effusion method: Knudsen cell according to OECD Test Guideline 104 (2006). The vapour pressure was determined at 61, 66, 71, 76 and 81 °C. The logarithm of the vapour pressure was plotted as a function of the inverse temperature 1/T. The vapour pressure at 20, 25 and 50 °C was determined by linear regression of the measured values. The vapour pressure of the test item was found to be 2.9 × 10-5, 6.4 x 10-5 and 2.3 × 10-3 Pa at 20, 25 and 50 °C.
Reference
The vapour pressure was measured in the temperature range of 61 to 81 °C.
Results of the Effusion method
No. | Temperature / °C | Vapour pressure / Pa |
1 | 61 | 9.15 x 10-3 |
2 | 66 | 1.74 x 10-2 |
3 | 71 | 3.30 x 10-2 |
4 | 76 | 5.73 x 10-2 |
5 | 81 | 9.66 x 10-2 |
The logarithm of the vapour pressure was plotted as a function of the inverse temperature 1/T. From the measured data points of the vapour pressure curve the constants A and B of the Antoine equation
can be derived by regression of the data points to
A = 16.0327
B = -6031.48
C = 273.15.
The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C.
Calculated vapour pressure values for 20, 25 and 50 °C
Temperature / °C | Vapour pressure / Pa |
20 | 2.9 × 10-5 |
25 | 6.4 × 10-5 |
50 | 2.3 × 10-3 |
Description of key information
The vapour pressure of the test item was found to be 6.4 x 10-5 Pa at 25 °C (reference 4.6-1).
Key value for chemical safety assessment
- Vapour pressure:
- 0 Pa
- at the temperature of:
- 25 °C
Additional information
The vapour pressure of the test item was determined using the Effusion method: Knudsen cell according to OECD Test Guideline 104 (2006). The vapour pressure was determined at 61, 66, 71, 76 and 81 °C. The logarithm of the vapour pressure was plotted as a function of the inverse temperature 1/T. The vapour pressure at 20, 25 and 50 °C was determined by linear regression of the measured values. The vapour pressure of the test item was found to be 2.9 × 10-5, 6.4 x 10-5 and 2.3 × 10-3 Pa at 20, 25 and 50 °C.
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