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Vapour pressure

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Reference
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

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.

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.

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.