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EC number: 201-161-1 | CAS number: 78-95-5
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 2020-05-18 to 2020-06-30
- 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:
- 2008
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- dynamic method
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 15.7 hPa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 20.7 hPa
- Conclusions:
- The vapour pressure of the test item at 20 °C is 15.7 hPa.
- Executive summary:
The vapour pressure of the test item was determined according to Regulation (EC) No. 440/2008 Method A.4. Vapour pressure and OECD Test Guideline 104 (2006). The dynamic method was used to determine the vapour pressure in the temperature range of 32.6 to 70.1 °C. 9 measurement points were recorded. The vapour pressure of the test item was calculated by extrapolation and interpolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C to be 15.7, 20.7 and 72.6 hPa, respectively.
Reference
The vapour pressure was measured in the temperature range of 30.7 °C to 174.2 °C. The measured vapour pressure values and the corresponding measured temperatures are summarised in the following table.
Measurement |
Temperature / |
Vapour pressure / |
Remark |
1 |
32.6 |
30.7 |
measured up |
2 |
50.3 |
74.2 |
measured up |
3 |
56.6 |
99.7 |
measured up |
4 |
62.0 |
124.3 |
measured up |
5 |
66.4 |
149.2 |
measured up |
6 |
70.1 |
174.2 |
measured up |
7 |
68.1 |
159.5 |
measured down |
8 |
64.0 |
134.8 |
measured down |
9 |
59.2 |
109.8 |
measured down |
The logarithm of the vapour pressure p as a function of the inverse temperature 1/T was plotted. 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 = 10.3669, B = -2102.38, C = 273.15.
Antoine equation: log p = A + B / (C + T)
The vapour pressure values were calculated for 20 °C, 25 °C and 50 °C.
Temperature / |
Vapour pressure / |
20 |
15.7 |
25 |
20.7 |
50 |
72.6 |
Description of key information
The vapour pressure of the test item at 20 °C is 15.7 hPa (reference 4.6-1).
Key value for chemical safety assessment
- Vapour pressure:
- 15.7 hPa
- at the temperature of:
- 20 °C
Additional information
The vapour pressure of the test item was determined according to Regulation (EC) No. 440/2008 Method A.4. Vapour pressure and OECD Test Guideline 104 (2006). The dynamic method was used to determine the vapour pressure in the temperature range of 32.6 to 70.1 °C. 9 measurement points were recorded. The vapour pressure of the test item was calculated by extrapolation and interpolation of the measured vapour pressure curve for the temperatures 20, 25 and 50 °C to be 15.7, 20.7 and 72.6 hPa, respectively.
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