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EC number: 619-269-6 | CAS number: 97398-80-6
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:
- 2006-11-23 to 2007-01-17
- 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:
- Council Directive 92/69/EEC
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: vapour pressure balance
- Temp.:
- 20 °C
- Vapour pressure:
- 0.016 Pa
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- 0.037 Pa
- Temp.:
- 50 °C
- Vapour pressure:
- 1.5 Pa
- Conclusions:
- The estimated vapour pressure of the test item at 25 °C is 0.037 Pa (reference 4.6-1).
- Executive summary:
The vapour pressure of test item has been determined in an experimental study according to OECD Guideline n. 104 (2006) and the EEC Directive 92/69. A vapour pressure balance (effusion method) was used to measure the vapour pressure of the test item in the temperature range of 20 °C to 56 °C. Above 33 °C a vapour pressure could be measured. The calculated vapour pressure values are extrapolated with the Antoine constants from the regression of the data above 37 °C for temperatures 20, 25 and 50 °C. The estimated values at 20, 25 and 50 °C are 1.6 x 10-2, 3.7 x 10-2 and 1.5 Pa, respectively.
Reference
The vapour pressure was measured in the temperature range of 20 °C to 56 °C. Above 33 °C a vapour pressure could be measured. The measured vapour pressures at the corresponding temperatures are listed in the following table:
No. |
Temperature / °C |
Vapour pressure / hPa |
1 |
33.0 |
5.0 x 10-5 |
2 |
33.7 |
1.8 x 10-5 |
3 |
35.0 |
4.3 x 10-4 |
4 |
36.6 |
5.4 x 10-4 |
5 |
36.7 |
1.3 x 10-3 |
6 |
37.8 |
2.3 x 10-3 |
7 |
40.0 |
3.7 x 10-3 |
8 |
42.0 |
5.6 x 10-3 |
9 |
44.1 |
6.2 x 10-3 |
10 |
48.0 |
1.3 x 10-2 |
11 |
52.3 |
1.9 x 10-2 |
12 |
55.8 |
3.0 x 10-2 |
The course of the vapour pressure as a function of the inverse temperature shows an untypical profile in the temperature range 33 - 37 °C (data points 1 - 5). Above 38 °C the vapour pressure showed its typical curve. Due to this the regression according to the Antoine equation was only performed for the vapour pressure (data points 6-12). This gives a conservative estimation of the vapour pressure of the test item also at 20, 25 and 50 °C. The regression data are:
log (p/hPa) = A + B/(C+T[°C])
A = 17.26088
B = -6169.89
C = 273.15
The calculated vapour pressure values are depicted in the following table:
T/°C |
p/hPa |
p/Pa |
20 |
1.6 x 10-4 |
1.6 x 10-2 |
25 |
3.7 x 10-4 |
3.7 x 10-2 |
50 |
1.5 x 10-2 |
1.5 |
Description of key information
The estimated vapour pressure of the test item at 25 °C is 3.7 x 10-2 Pa (reference 4.6-1).
Key value for chemical safety assessment
- Vapour pressure:
- 0.037 Pa
- at the temperature of:
- 25 °C
Additional information
The vapour pressure of test item has been determined in an experimental study according to OECD Guideline n. 104 (2006) and the EEC Directive 92/69. A vapour pressure balance (effusion method) was used to measure the vapour pressure of the test item in the temperature range of 20 °C to 56 °C. Above 33 °C a vapour pressure could be measured. The calculated vapour pressure values are extrapolated with the Antoine constants from the regression of the data above 37 °C for temperatures 20, 25 and 50 °C. The estimated values at 20, 25 and 50 °C are 1.6 x 10-2, 3.7 x 10-2 and 1.5 Pa, respectively.
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