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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
21 January - 10 March 2004
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
gas saturation method
Specific details on test material used for the study:
- Batch: 00410155
- Purity: 96%
- Expiry date: 05 May 2004
- Storage conditions: at room temperature at about 20°C, away from direct sunlight
Temp.:
25 °C
Vapour pressure:
0.005 Pa
Remarks on result:
other: Experimentally determined.
Temp.:
35 °C
Vapour pressure:
0.017 Pa
Remarks on result:
other: Experimentally determined.
Temp.:
45 °C
Vapour pressure:
0.066 Pa
Remarks on result:
other: Experimentally determined.
Temp.:
25 °C
Vapour pressure:
0.005 Pa
Remarks on result:
other: Extrapolation based on the simplified Clausius-Clapeyron equation.

To ensure saturation control, three flow rates were used at each temperature. From the results it could be concluded that higher flow rates did not lead to lower vapour pressures which means that the nitrogen was saturated with test item under the conditions of the test.

The good reproducibility and the high trapping efficiency (90.3 - 100%) led to the conclusion that the results of the vapour pressure determination of the test item T002251 are reliable.

Conclusions:
Extrapolation of the vapour pressure of T002251 based on the simplified Clausius-Clapeyron equation resulted in a vapour pressure of 4.7E-03 Pa at 25°C. This value is in excellent agreement with the value determined by direct measurements at 25°C, which was 5.1E-03 Pa.

Description of key information

The vapour pressure of T002251 was determined using the gas saturation method according to the guidelines OECD 104 and EU A.4 (K1, Tognucci, 2004). Direct measurement at 25°C resulted in a vapour pressure of 5.1E-03 Pa, which is in agreement with the value assessed by extrapolation based on the simplified Clausius-Clapeyron equation which resulted in a vapour pressure of 4.7E-03 Pa at the same temperature.

Key value for chemical safety assessment

Vapour pressure:
0.005 Pa
at the temperature of:
25 °C

Additional information