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EC number: 202-796-7 | CAS number: 99-87-6
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:
- from 2020-06-17 to 2020-07-13
- 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:
- 2006
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Version / remarks:
- Regulation (EC) No 440/2008
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Version / remarks:
- 1996
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- dynamic method
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 2.11 hPa
- Temp.:
- 25 °C
- Vapour pressure:
- 2.84 hPa
- Temp.:
- 50 °C
- Vapour pressure:
- 10.96 hPa
- Conclusions:
- The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 °C, 25 °C and 50 °C to be 2.11, 2.84 and 10.96 hPa, respectively.
- Executive summary:
A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and EPA OPPTS 830.7950 to determine the vapour pressure of the test item using the dynamic method: Vapour-liquid equilibrium (VLE). When reaching the thermodynamic equilibrium, the vapour pressure of the test item was calculated using the Antoine equation. Within the experiment a vapour pressure curve with 6 data points was measured over a pressure range between 80 to 300 hPa. The vapour pressure was measured in the temperature range of 94.4 °C to 133.6 °C. The vapour pressure was calculated to be 2.11 hPa at 20 °C, 2.84 hPa at 25 °C and 10.96 hPa at 50 °C, respectively.
Reference
The vapour pressure was measured in the temperature range of 94.4 °C to 133.6 °C.
Table 1: Results of the dynamic method
Measurement No. |
Temperature / °C |
Vapour pressure / hPa |
Remark |
1 |
94.4 |
79.7 |
measured up |
2 |
102.5 |
99.4 |
measured up |
3 |
113.2 |
149.4 |
measured up |
4 |
121.1 |
198.8 |
measured up |
5 |
127.6 |
248.7 |
measured up |
6 |
133.6 |
298.4 |
measured up |
7 |
130.4 |
274.1 |
measured down |
8 |
123.7 |
224.8 |
measured down |
9 |
116.1 |
173.8 |
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 linear regression of the data points to
A = 10.0424
B = -2262.86
C= 273.15.
The vapour pressure values of the lest item which were calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 °C, 25 °C and 50 °C.
Table 2: Calculated vapour pressure values for 20 °C, 25 °C and 50
°C
Temperature / °C |
Vapour pressure / hPa |
20 |
2.11 |
25 |
2.84 |
50 |
10.96 |
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 °C, 25 °C and 50 °C to be 2.11, 2.84 and 10.96 hPa, respectively.
Key value for chemical safety assessment
- Vapour pressure:
- 2.11 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 EPA OPPTS 830.7950 to determine the vapour pressure of the test item using the dynamic method: Vapour-liquid equilibrium (VLE). When reaching the thermodynamic equilibrium, the vapour pressure of the test item was calculated using the Antoine equation. Within the experiment a vapour pressure curve with 6 data points was measured over a pressure range between 80 to 300 hPa. The vapour pressure was measured in the temperature range of 94.4 °C to 133.6 °C. The vapour pressure was calculated to be 2.11 hPa at 20 °C, 2.84 hPa at 25 °C and 10.96 hPa at 50 °C, respectively.
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