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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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
not specified
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
not specified
GLP compliance:
no
Type of method:
effusion method: vapour pressure balance
Temp.:
20 °C
Vapour pressure:
0.114 Pa
Remarks on result:
other: calculated from experimental values
Temp.:
25 °C
Vapour pressure:
0.168
Remarks on result:
other: calculated from experimental values
Temp.:
30.1 °C
Vapour pressure:
0.248 Pa
Remarks on result:
other: experimental result
Temp.:
40.1 °C
Vapour pressure:
0.507 Pa
Remarks on result:
other: experimental result
Temp.:
50 °C
Vapour pressure:
0.996 Pa
Remarks on result:
other: experimental result

Areas and transmission probability factors of the effusion orifices used in the present work

Cell  l/mm  A0/mm2  w0
 I 0.05  0.779  0.964
 II 0.05 0.781  0.964
 III 0.05 0.790   0.964
 IV  0.025 0.776   0.981
 V  0.025 0.770   0.981
 VI  0.025 0.776   0.981

Results obtained in the measurement of the vapor pressures of the test item

 T / °C  t  Cell    m/ mg  p /Pa
 30.1  02h56m  I  6.20  0.2414
     II  6.57  0.2551
 40.1  02h49m  III  12.09  0.4909
     IV  12.90  0.5238
 49.97  03h01m  V  25.47  0.9898
     VI  25.99  1.0018

Conclusions:
The vapour pressure of the test item is 0.114 Pa at 20 °C.
Executive summary:

The vapor pressure of the test item was measured using the Knudsen effusion method (mass-loss technique), according to the

guidelines OECD 104 / EU A.4. The quality of the apparatus was previously verified with the measurement of well-known reference compounds. Experiments were performed at three temperatures between 30 °C and 50 °C. For every experiment (temperature), a minimum of two effusion cells were used simultaneously. A total of six different cells were used in the experiments, with effusion orifices of approx. 1 mm in diameter, in gold foil with a thickness of 0.05 mm or 0.025 mm. Results permit the establishment of the relation between the vapor pressure of the compound and temperature, allowing the knowledge of the vapor pressure at different temperatures. Based on the results, the vapor pressure of the compound is calculated as being equal to 0.114 Pa at 20 °C, and 0.168 Pa at 25 °C.

Description of key information

The vapour pressure of the test item is 0.114 Pa at 20 °C.

Key value for chemical safety assessment

Vapour pressure:
0.114 Pa
at the temperature of:
20 °C

Additional information