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EC number: 811-188-6 | CAS number: 16184-79-5
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 2017-04-24 to 2017-11-13
- 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
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- static method
- Specific details on test material used for the study:
- Batch no.: I1400986-MG-06-050.6_MG-06-087.1
Purity: 98.4 % - Key result
- Temp.:
- 20 °C
- Vapour pressure:
- 106 Pa
- Temp.:
- 25 °C
- Vapour pressure:
- 147 Pa
- Conclusions:
- The vapour pressure of the test item was calculated to be 106 Pa at 20 °C and 147 Pa at 25 °C, respectively.
- Executive summary:
A study was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at six different temperatures (20, 27, 35, 43.8, 51.6 and 59.9 °C) using the static method. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure was calculated to be 106 Pa at 20 °C and 147 Pa at 25 °C, respectively.
Reference
Table 1. Measured values
1st Determination |
2nd Determination |
||
Temp. in °C |
Pressure in hPa |
Temp. in °C |
Pressure in hPa |
20.0 |
1.1 |
52.9 |
7.6 |
27.0 |
1.7 |
43.1 |
4.4 |
35.0 |
2.7 |
34.1 |
2.7 |
43.8 |
4.6 |
26.0 |
1.6 |
51.6 |
6.9 |
20.0 |
1.0 |
59.9 |
10.9 |
16.0 |
0.8 |
Calculation of results
From the measured values for the increasing and for the decreasing temperature, log P (in log Pa) and 1/T (in 1/K) were calculated. The measured and the calculated values were plotted (p against T and log P against 1/T).
The regression curve with slope B, intercept A and correlation r was calculated (graph log P vs. 1/T). From the values of these parameters, vapour pressures at 20.0 and at 25.0 °C were calculated using the following equation:
log P = B*1/T+A
where B = -2477.989935 and A = 10.47927829
Table 2. Calculated parameters
n |
Temperature T |
Pressure P |
Temperature T |
1/T |
log P |
|
°C |
hPa |
K |
1/K |
log Pa |
1 |
20.0 |
1.1 |
293.15 |
0.00341122 |
2.0414 |
2 |
27.0 |
1.7 |
300.15 |
0.00333167 |
2.2304 |
3 |
35.0 |
2.7 |
308.15 |
0.00324517 |
2.4314 |
4 |
43.8 |
4.6 |
316.95 |
0.00315507 |
2.6628 |
5 |
51.6 |
6.9 |
324.75 |
0.00307929 |
2.8388 |
6 |
59.9 |
10.9 |
333.05 |
0.00300255 |
3.0374 |
7 |
52.9 |
7.6 |
326.05 |
0.00306701 |
2.8808 |
8 |
43.1 |
4.4 |
316.25 |
0.00316206 |
2.6435 |
9 |
34.1 |
2.7 |
307.25 |
0.00325468 |
2.4314 |
10 |
26.0 |
1.6 |
299.15 |
0.00334280 |
2.2041 |
11 |
20.0 |
1.0 |
293.15 |
0.00341122 |
2.0000 |
12 |
16.0 |
0.8 |
289.15 |
0.00345841 |
1.9031 |
The calculated values at 20 and 25 were as follows:
Table 3. Calculated vapour pressure at 20 and 25 °C.
Parameter |
Value |
Unit |
Vapour Pressure (20 °C) |
106 |
Pa |
Vapour Pressure (25 °C) |
147 |
Pa |
Description of key information
The vapour pressure of the test item was calculated to be 106 Pa at 20 °C and 147 Pa at 25 °C, respectively.
Key value for chemical safety assessment
- Vapour pressure:
- 106 Pa
- at the temperature of:
- 20 °C
Additional information
A study was conducted according to OECD TG 104 and Regulation (EC) No 440/2008 method A.4 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at six different temperatures (20, 27, 35, 43.8, 51.6 and 59.9 °C) using the static method. The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The vapour pressure was calculated to be 106 Pa at 20 °C and 147 Pa at 25 °C, respectively.
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