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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:
2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
not specified
Type of method:
effusion method: Knudsen cell
Specific details on test material used for the study:
Batch no.: lot # JBGJ0045R
Purity: 100% (UVCB)
Key result
Temp.:
20 °C
Vapour pressure:
0.01 Pa
Remarks on result:
other: calculated from the regression equation
Key result
Temp.:
25 °C
Vapour pressure:
0.012 Pa
Remarks on result:
other: calculated from the regression equation
Key result
Temp.:
45 °C
Vapour pressure:
0.028 Pa
Key result
Temp.:
60 °C
Vapour pressure:
0.047 Pa
Key result
Temp.:
75 °C
Vapour pressure:
0.077 Pa

Table 1. Measured values for temperature and vapour pressure        

 Temperature (°C)  Vapour pressure (Pa)  Standart deviation (Pa)
 45  2.77E-02  1.97E-03
 60  4.67E-02  2.60E-03
 75  7.71E-02  1.11E-02

For the test substance, the following vapour pressures at 20 °C and at 25 °C were calculated from the regression equation:

20°C: 1.00E-02 Pa

25°C: 1.24E-02 Pa

The linear regression of log p vs. 1/T gave a correlation coefficient r of - 0.9999, showing good repeatability and precision. Therefore, the determination is considered as valid.

Conclusions:
Under the study conditions, the vapour pressures of the test substance were dextrapolated using regression line and were determined to be 1.00E-02 and 1.24E-02 Pa at 20 and 25°C, respectively (Knudsen cell).
Executive summary:

A study was conducted to determine the vapour pressure of the test substance according to OECD Guideline 104 and EU Method A.4 (Knudsen cell). The vapour pressure of the test substance was determined by the Knudsen cell effusion method. The test substance was weighed into the 4 Knudsen cells, which were set into vacuum chamber at 10E-05 Pa or lower followed by measurements at 30, 45, 60 and 75°C. The measurement at 30°C showed no significant weight loss. Therefore, this experiment was not included in the evaluation. The measured values for temperature and vapour pressure were evaluated as follows: 2.77E-02, 4.67E-02 and 7.71E-02 at 45, 60 and 75°C, respectively. Under the study conditions, the vapour pressures of the test substance were extrapolated using regression line and were determined to be 1.00E-02 and 1.24E-02 Pa at 20 and 25°C, respectively (Henke, 2015).

Description of key information

The vapour pressure was determined according to OECD Guideline 104 and EU Method A.4 (Knudsen cell) (Henke, 2015)

Key value for chemical safety assessment

Vapour pressure:
0.028 Pa
at the temperature of:
45 °C

Additional information

Vapour pressure at 45, 60 and 75°C = 2.77E-02, 4.67E-02 and 7.71E-02 Pa; and at 20 and 25°C (extrapolated using regression line) = 1.00E-02 and 1.24E-02 Pa