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EC number: 203-965-8 | CAS number: 112-38-9
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:
- 2009-04-15 till 2009-05-14
- 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:
- effusion method: by loss of weight or by trapping vaporisate
- Temp.:
- ca. 20 °C
- Vapour pressure:
- ca. 0.019 Pa
- Remarks on result:
- other: Value obtained by extrapolation and use of the regression curve.
- Transition / decomposition:
- no
- Conclusions:
- The vapour pressure of Undec-10-enoic acid at 20°C (293K) was determined using the isothermal thermogravimetric effusion method (EC A.4, OECD 104), to be 1.92 x 10E-2 Pa =1.44 x 10E-4 mm Hg.
- Executive summary:
A guideline study without deviations (OECD 104 and EU Method A.4) and under GLP is available. The purpose of the study was to evaluate the vapour pressure of the test substance at 20°C using the isothermal thermogravimetric Effusion method. By extrapolation to 20°C, the vapour pressure of Undec-10-enoic acid at 20°C (293K) was determined to be 1.92 x 10E-2 Pa which is equivalent to 1.44 x 10E-4 mm Hg.
Reference
Table 1: Results of the isothermal TGA analysis
| Temperature (°C) | Weight loss (µg/min) | v(T) (g/cm²/h) | log v(T) |
| 80 | 5.800 | 6.29 x 10E-4 | -3.16 |
| 80 | 6.602 | 7.88 x 10E-4 | -3.1 |
| 90 | 13.67 | 1.63 x 10E-3 | -2.79 |
| 90 | 14.69 | 1.75 x 10E-3 | -2.76 |
| 100 | 31.07 | 3.71 x 10E-3 | -2.43 |
| 100 | 32.41 | 3.87 x 10E-3 | -2.41 |
| 110 | 65.18 | 7.78 x 10E-3 | -2.11 |
| 110 | 67.12 | 8.01 x 10E-3 | -2.10 |
A figure showing the plot of the log v(T) of the test substance as function of the reciprocal temperatures is given in the original study report. The coefficient of correlation (r) was > 0.99. Extrapolation of the curve to 20°C resulted in a value of -5.83 for the log v(T, 20) of the test substance. Fining this value in the regression curve, a vapour pressure of 1.92 x 10E-2 Pa = 1.44 x l0E-4 mm Hg was obtained.
Description of key information
The vapour pressure of Undec-10-enoic acid at 20°C (293K) was determined to be 1.92 x 10E-2 Pa.
Key value for chemical safety assessment
- Vapour pressure:
- 0.019 Pa
- at the temperature of:
- 20 °C
Additional information
The vapour pressure of undecylenic acid was determined in a OECD Guideline 104 study, without deviations and under GLP. The isothermal thermogravimetric effusion method was being applied. The vapour pressure of Undec-10-enoic acid at 20°C (293K) was determined to be 1.92 x 10E-2 Pa = 1.44 x 10E-4 mm Hg.
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