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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:
2008-12-15 to 2009-01-19
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP 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
Specific details on test material used for the study:
- Name of test material (as cited in study report): Dibenzyltoluene (Dibenzylbenzene, ar-methyl derivative)
- Substance type: product
- Physical state: liquid
- Lot/batch No.: 0845
- Expiration date of the lot/batch: 2009-10-08 at the earliest
- Storage condition of test material: in a closed vessel at room temperature (20 ± 5°C)
- Other:
Production date: 2008-10-08
Appearance: colourless to yellow, clear liquid
Key result
Temp.:
ca. 20 °C
Vapour pressure:
ca. 0.001 Pa
Remarks on result:
other: Calculated from the regression equation
Key result
Temp.:
ca. 25 °C
Vapour pressure:
ca. 0.002 Pa
Remarks on result:
other: Calculated from the regression equation

Findings and Results

The vapour pressure was determined at eleven different temperatures. Seven temperatures could be evaluated. For these experiments, 1/T was plotted against log(P)

Vapour Pressures (Effusion Method)

 Experiment  T  P  Stand. Dev. P  RSD P
 No.  K  Pa  Pa  %
 5  310.3 4.41E-03   2.74E-03  62.1%
 6  320.1  1.47E-02  1.80E-03  12.3%
 7  334.7  2.89E-02  2.57E-03  8.9%
 8  349.3  9.13E-02  7.34E-03  8.0%
 9  363.9  2.26E-01 1.63 E-02  7.2%
 10  378.5  5.91E-01  1.27E-02  2.1%
 11  393.2  1.53E+00  2.64E-02  1.7%

In this table, E-03 represents *10 -3.

Evaluation

The graph 1/T vs. log(P) shows a straight line with a correlation coefficient of - 0.997.

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

Vapour pressure at 20 °C: 1.01 * 10 -3 Pa

Vapour pressure at 25 °C: 1.62 * 10 -3 Pa

Conclusions:
The vapour pressure was determined at eleven different temperatures. Seven temperatures could be evaluated. For these experiments, 1/T was plotted against log(P). The graph 1/T vs. log(P) shows a straight line with a correlation coefficient of - 0.997.
For the test item Dibenzyltoluene, the following vapour pressures at 20°C and at 25°C were calculated from the regression equation:
Vapour pressure at 20 °C: 1.01 * 10 -3 Pa
Vapour pressure at 25 °C: 1.62 * 10 -3 Pa

Description of key information

For Dibenzylbenzene, ar-methyl derivative, the following vapour pressures at 20°C and at 25°C were determined:
Vapour pressure at 20 °C: 1.01 * 10 -3 Pa
Vapour pressure at 25 °C: 1.62 * 10 -3 Pa

Key value for chemical safety assessment

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

Additional information