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EC number: 208-686-5 | CAS number: 538-23-8
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 27-Oct-2017 to 15-Jan-2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- OECD guideline study, conducted under GLP. Test substance adequately identified. Therefore full validation applies.
- 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
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- effusion method: isothermal thermogravimetry
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- >= 0 - <= 0 Pa
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- >= 0 - <= 0 Pa
- Conclusions:
- The isothermal TGA effusion method was applied for the determination of the vapour pressure of COCONAD RK.
The vapour pressure of the test item at 20 °C (293K) and 25 °C (298K) was:
at 20°C: 2.1 x 10-8 - 3.8 x 10-7 Pa
at 25°C: 6.0 x 10-8 - 9.3 x 10-7 Pa - Executive summary:
The objective of this study is to determine the following physico-chemical properties for COCONAD RK
The isothermal TGA effusion method was applied for the determination of the vapour pressure of COCONAD RK.
The vapour pressure of the test item at 20 °C (293K) and 25 °C (298K) was:
20 °C
25 °C
[Pa]
[mm Hg]
[Pa]
[mm Hg]
Test item
2.1 x 10-8- 3.8 x 10-7
1.6 x 10-10- 2.9 x 10-9
6.0 x 10-8- 9.3 x 10-7
4.5 x 10-10- 7.0 x 10-9
Reference
The results of the isothermal TGA analysis for the test item are given inTable 1.
Using the results of Experiment 1 and Experiment 2, the curve of log PT of the test item as function of the reciprocal temperature had a coefficient of correlation <0.99. Therefore, a third experiment was performed. Coefficient of correlation using the results of Experiment 1 -Experiment 3 and Experiment 2 - Experiment 3 was >0.99 however <0.99 when using the results of Experiment 1 and Experiment 2. Therefore it was decided to report a range for the vapour pressure using the plot of the log PT of the test item as function of the reciprocal temperatures for each individual experiment.
Table 1
Results of the isothermal TGA analysis
Experiment |
Temperature |
Weight loss |
νT |
logνT |
logPT |
PT |
|
|
|
|
|
|
|
1 |
140 |
0.937755 |
1.12´10-4 |
-3.95 |
0.08 |
1.2 |
|
150 |
2.05449 |
2.45´10-4 |
-3.61 |
0.52 |
3.3 |
|
160 |
4.55225 |
5.43´10-4 |
-3.26 |
0.96 |
9.1 |
|
170 |
9.30061 |
1.11´10-3 |
-2.95 |
1.36 |
23 |
|
|
|
|
|
|
|
2 |
140 |
1.42027 |
1.70´10-4 |
-3.77 |
0.31 |
2.0 |
|
150 |
2.83320 |
3.38´10-4 |
-3.47 |
0.69 |
4.9 |
|
160 |
5.47995 |
6.54´10-4 |
-3.18 |
1.06 |
12 |
|
170 |
10.5334 |
1.26´10-3 |
-2.90 |
1.42 |
27 |
|
|
|
|
|
|
|
3 |
140 |
1.02948 |
1.23´10-4 |
-3.91 |
0.13 |
1.4 |
|
150 |
2.25194 |
2.69´10-4 |
-3.57 |
0.57 |
3.7 |
|
160 |
4.72198 |
5.64´10-4 |
-3.25 |
0.98 |
9.5 |
|
170 |
9.31692 |
1.11´10-3 |
-2.95 |
1.36 |
23 |
|
|
|
|
|
|
|
The plot of the log PT of the test item as function of the reciprocal temperatures obtained with Experiment 1 gives the following equation for the curve:
log PT= -7816´1/T + 19.0 (r = 0.99992, n = 4).
The results of the vapour pressure at 20 °C and 25 °C are given in Table 2.
The plot of the log PT of the test item as function of the reciprocal temperatures obtained with Experiment 2 gives the following equation for the curve:
log PT= -6789´1/T + 16.7 (r = 0.99996, n = 4).
The results of the vapour pressure at 20 °C and 25 °Care given in Table 3.
Table 2
Vapour pressure of the test item (Experiment 1)
Temperature |
logPT |
PT |
PT |
20 |
-7.67 |
2.1´10-8 |
1.6´10-10 |
25 |
-7.22 |
6.0´10-8 |
4.5´10-10 |
Table 3
Vapour pressure of the test item (Experiment 2)
Temperature |
logPT |
PT |
PT |
20 |
-6.42 |
3.8´10-7 |
2.9´10-9 |
25 |
-6.03 |
9.3´10-7 |
7.0´10-9 |
Table 4
Vapour pressure of the test item (Experiment 3)
Temperature |
logPT |
PT |
PT |
20 |
-7.28 |
5.3´10-8 |
4.0´10-10 |
25 |
-6.85 |
1.4´10-7 |
1.1´10-9 |
The plot of the log PT of the test item as function of the reciprocal temperatures obtained with Experiment 3 gives the following equation for the curve:
log PT= -7482´1/T + 18.3 (r = 0.99994, n = 4).
The results of the vapour pressure at 20 °C and 25 °C are given in Table 4.
Description of key information
>= 6.0E-8 to <= 9.3E-7 Pa at 25 °C
>= 2.1E-8 to <= 3.8E-7 Pa at 20 °C
(effusion method: isothermal thermogravimetry, OECD 104)
A fully reliable experimental study, conducted according to OECD/EU guideline, effusion method, and under GLP, is available. It is considered as a key study. The result is retained as key data.
Key value for chemical safety assessment
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