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EC number: 944-953-9 | CAS number: 73326-59-7
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:
- from 2017-04-06 to 2017-06-06
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Deviations:
- no
- GLP compliance:
- no
- Remarks:
- This study was not performed under the Principles of Good Laboratory Practice (GLP).
- Type of method:
- dynamic method
- Remarks:
- Vapour-liquid equilibrium (VLE)
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.05 hPa
- Temp.:
- 25 °C
- Vapour pressure:
- 0.08 hPa
- Temp.:
- 50 °C
- Vapour pressure:
- 0.54 hPa
- Conclusions:
- 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, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure. It was extrapolated to be 0.05 hPa at 20 °C, 0.08 hPa at 25 °C and 0.54 hPa at 50 °C.
- Executive summary:
A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. A vapour pressure curve with 9 data points was measured over a pressure range between 23 to 75 hPa. For control 3 measuring points were evaluated with decreasing pressure. The vapour pressure was measured in the temperature range of 115.6 to 141.8 °C. From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation were derived and 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, according to Regulation EC No. 440/2008 Method A.4. The vapour pressure was determined to be 0.05 hPa at 20 °C, 0.08 hPa at 25 °C and 0.54 hPa at 50 °C, respectively.
Reference
The vapour pressure was measured in the temperature range of 115.6 to 141.8 °C.
Results of the dynamic method
No. |
Temperature / °C |
Vapour pressure / hPa |
Remark |
1 |
115.6 |
22.6 |
measured up |
2 |
123.5 |
35.4 |
measured up |
3 |
129.0 |
45.2 |
measured up |
4 |
134.0 |
54.9 |
measured up |
5 |
137.3 |
62.2 |
measured up |
6 |
141.8 |
74.9 |
measured up |
7 |
139.1 |
66.2 |
measured down |
8 |
134.5 |
58.5 |
measured down |
9 |
130.8 |
48.0 |
measured down |
From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation were derived by regression.
A = 11.4512
B = -3140.08
C = 273.15
Calculated vapour pressure values for 20, 25 and 50 °C
Temperature / °C |
Vapour pressure / hPa |
20 |
0.05 |
25 |
0.08 |
50 |
0.54 |
Description of key information
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, according to Regulation EC No. 440/2008 Method A.4. Vapour Pressure. It was extrapolated to be 0.05 hPa at 20 °C, 0.08 hPa at 25 °C and 0.54 hPa at 50 °C.
Key value for chemical safety assessment
- Vapour pressure:
- 0.05 hPa
- at the temperature of:
- 20 °C
Additional information
A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. A vapour pressure curve with 9 data points was measured over a pressure range between 23 to 75 hPa. For control 3 measuring points were evaluated with decreasing pressure. The vapour pressure was measured in the temperature range of 115.6 to 141.8 °C. From the measured data points of the vapour pressure curve the constants A, B and C of the Antoine equation were derived and 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, according to Regulation EC No. 440/2008 Method A.4. The vapour pressure was determined to be 0.05 hPa at 20 °C, 0.08 hPa at 25 °C and 0.54 hPa at 50 °C, respectively.
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