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EC number: 213-126-8 | CAS number: 925-83-7
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 06 Aug 2018 - 19 Oct 2018
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 018
Materials and methods
Test guidelineopen allclose all
- 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:
- 2016
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7950 (Vapor Pressure)
- Version / remarks:
- 1996
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- effusion method: isothermal thermogravimetry
Test material
- Reference substance name:
- Sebacohydrazide
- EC Number:
- 213-126-8
- EC Name:
- Sebacohydrazide
- Cas Number:
- 925-83-7
- Molecular formula:
- C10H22N4O2
- IUPAC Name:
- sebacohydrazide
- Test material form:
- solid: particulate/powder
- Details on test material:
- Test item name (as stated in report): SDH
Test item storage: at room temperature protected from light
Constituent 1
- Specific details on test material used for the study:
- Decomposition starts at ca. 225°C.
Results and discussion
Vapour pressureopen allclose all
- Key result
- Temp.:
- 20 °C
- Vapour pressure:
- < 0 Pa
- Remarks on result:
- not determinable
- Remarks:
- value derived by comparison with ref. substance chrysene
- Key result
- Temp.:
- 25 °C
- Vapour pressure:
- < 0 Pa
- Remarks on result:
- not determinable
- Remarks:
- value derived by comparison with ref. substance chrysene
Any other information on results incl. tables
Table:Results of the Vapour pressure Isothermal TGA Analysis
Temperature |
Weight loss |
νT |
log νT |
log PT |
PT |
150 |
0.223508 |
2.67 x 10-5 |
-4.57 |
-0.72 |
0.19 |
|
0.207783 |
2.48 x10-5 |
-4.61 |
-0.76 |
0.17 |
160 |
0.263423 |
3.14 x 10-5 |
-4.50 |
-0.63 |
0.24 |
|
0.225047 |
2.69 x 10-5 |
-4.57 |
-0.71 |
0.19 |
170 |
0.673834 |
8.04 x10-5 |
-4.09 |
-0.10 |
0.79 |
|
0.440297 |
5.26 x 10-5 |
-4.28 |
-0.34 |
0.46 |
The log P(T) versus 1/T curve for the substance over the range 150 -170°C showed poor linearity (correlation coefficient r < 0.99). Extrapolation of the curve to 20°C or 25°C would not give reliable results for the vapour pressure of the substance at these temperatures.
Since no accurate vapour pressure could be calculated from the obtained results, the weight losses of the test item (see Illustration) were compared with the weight loss results of chrysene at temperatures of 160°C and 170°C.
The weight loss curve of this reference substance is shown in the Illustration.
Since the weight loss of the test item was lower than the weight loss of the reference substance, the vapour pressure of the test item is considered to be below the vapour pressure of chrysene. According to this the vapour pressure of the test item is derived as presented in the table below:
|
20°C |
25°C |
||
|
[Pa] |
[mm Hg] |
[Pa] |
[mm Hg] |
Test item |
< 8.4 x 10-7 |
< 6.3 x 10-9 |
< 6.6 x 10-7 |
< 4.9 x 10-9 |
Applicant's summary and conclusion
- Conclusions:
- The vapour pressure of the substance at 20°C and 25°C was determined to be <8.4E-7 Pa and <6.6E-7 Pa, resp.
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