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EC number: 249-528-5 | CAS number: 29232-93-7
Vapour pressure
Administrative data
Link to relevant study record(s)
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- GLP compliance:
- yes
- Type of method:
- gas saturation method
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 0.002 Pa
- Conclusions:
- The test substance has a vapour pressure of 0.002 Pa at 20 °C
- Executive summary:
The vapour pressure of the test substance was determined by the gas saturation method in accordance with the OECD TG 104 and the EC method A.4 and in compliance with GLP. The vapour pressure of the test substance was found to be 0.002 Pa at 20 °C.
Reference
The vapour pressure of pure test substance at 20 °C is 2.0E-6 kPa, equivalent to 1.5E-5 mm Hg (2.0E-8 atm). Experimental results are detailed in Table 1. No flow rate dependency was observed indicating that gas saturation had been achieved. Using Microsoft Excel version 5 linear regression was carried out on all the experimental values to produce the following equation:
lnVP = 24.51645295 - 11034.82575 (1/T) [correlation coefficient (r) of 0.9977].
Using this equation vapour pressures were interpolated within the experimental temperature range, see Table 2 in 'additional information on results'
It was demonstrated that the test substance could be quantitatively recovered from the U-tubes at the levels encountered during the actual measurements.
Table 1. Vapour Pressure Experimental Data
Ambient Temp(k) |
Oven Temp. (k) |
Tube |
Flowrate |
Time |
Mass |
Vapour pressure |
% RSD |
No. |
(cm3/min) |
(min) |
(kg) |
(kpa) |
|||
294 |
294 |
1 |
18.18 |
1262 |
5.810E-09 |
2.0E-06 |
4.9 |
2 |
18.34 |
6.910E-09 |
2.4E-06 |
||||
3 |
19.12 |
7.014E-09 |
2.3E-06 |
||||
4 |
28.14 |
1.028E-08 |
2.3E-06 |
||||
5 |
27.52 |
9.872E-09 |
2.3E-06 |
||||
6 |
28.76 |
1.035E-08 |
2.3E-06 |
||||
7 |
37.4 |
1.2985E-08 |
2.2E-06 |
||||
8 |
38.59 |
1.415E-08 |
2.3E-06 |
||||
9 |
35.92 |
1.281E-08 |
2.3E-06 |
||||
294 |
299 |
1 |
19.00 |
1072 |
9.776E-09 |
3.8E-06 |
5.8 |
2 |
19.40 |
9.751E-09 |
3.8E-06 |
||||
3 |
19.73 |
1.166E-08 |
4.4E-06 |
||||
4 |
29.04 |
1.560E-08 |
4.0E-06 |
||||
5 |
28.48 |
1.565E-08 |
4.1E-06 |
||||
6 |
29.78 |
1.716E-08 |
4.3E-06 |
||||
7 |
38.32 |
1.986E-08 |
3.9E-06 |
||||
8 |
39.84 |
2.236E-08 |
4.2E-06 |
||||
9 |
39.61 |
2.307E-08 |
4.4E-06 |
||||
294 |
304 |
1 |
18.77 |
1350 |
2.297E-08 |
7.3E-06 |
4.4 |
2 |
19.26 |
2.373E-08 |
7.3E-06 |
||||
3 |
19.56 |
2.489E-08 |
7.5E-06 |
||||
4 |
28.9 |
4.064E-08 |
8.3E-06 |
||||
5 |
28.25 |
3.673E-08 |
7.7E-06 |
||||
6 |
29.41 |
3.710E-08 |
7.0E-06 |
||||
7 |
37.70 |
5.065E-08 |
8.0E-06 |
||||
8 |
39.50 |
5.022E-08 |
7.5E-06 |
||||
9 |
35.91 |
4.458E-08 |
7.4E-06 |
||||
294 |
309 |
1 |
18.60 |
360 |
1.076E-08 |
1.3E-05 |
6.5 |
2 |
18.94 |
1.189E-08 |
1.4E-05 |
||||
3 |
19.06 |
1.141E-08 |
1.3E-05 |
||||
4 |
28.33 |
1.801E-08 |
1.4E-05 |
||||
5 |
27.78 |
1.609E-08 |
1.3E-05 |
||||
6 |
28.81 |
1.762E-08 |
1.4E-05 |
||||
7 |
37.64 |
1.965E-08 |
1.2E-05 |
||||
8 |
38.88. |
2.97E-08 |
1.4E-05 |
||||
9 |
39.18 |
2.580E-08 |
1.5E-05 |
||||
294 |
314 |
1 |
19.08 |
390 |
2.234E-08 |
2.4E-05 |
6.6 |
2 |
19.42 |
1.963E-08 |
2.1E-05 |
||||
3 |
19.68 |
2.419E-08 |
2.0E-05 |
||||
4 |
28.82 |
3.636E-08 |
2.6E-05 |
||||
5 |
28.46 |
3.385E-08 |
2.4E-05 |
||||
6 |
29.6 |
3.603E-08 |
2.0E-05 |
||||
7 |
38.25 |
4.800E-08 |
2.6E-05 |
||||
8 |
40.02 |
5.022E-08 |
2.0E-05 |
||||
9 |
40.22 |
5.147E-08 |
2.6E-05 |
Table 2. Vapour Pressure Interpolated Results
Temp ( °C) [K] |
VP kPa |
VP (mm Hg) |
VP (atm) |
|
40 [313] |
2.2E-05 |
1.7E-04 |
2.2E-07 |
|
35 [308] |
1.2E-05 |
9.0E-05 |
1.2E-07 |
|
30 [303] |
6.9E-06 |
5.2E-05 |
6.8E-08 |
|
25 [298] |
3.7E-06 |
2.8E-05 |
3.7E-08 |
|
20 [293] |
2.0E-06 |
1.5E-05 |
2.0E-08 |
|
Description of key information
0.002 Pa at 20 °C, gas saturation method, OECD TG 104, Husband 1997.
Key value for chemical safety assessment
- Vapour pressure:
- 0.002 Pa
- at the temperature of:
- 20 °C
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
