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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:
2017-12-01 to 2018-02-14
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:
no
Type of method:
effusion method: vapour pressure balance
Temp.:
20 °C
Vapour pressure:
0 Pa
Temp.:
25 °C
Vapour pressure:
0 Pa
Temp.:
50 °C
Vapour pressure:
0 Pa

The vapour pressure was measured in the temperature range of 10 °C to 110 °C. This range was chosen according to the temperatures for which results are to be reported, ending below the melting point of the test item. The measured vapour pressures at the corresponding temperatures are listed in Table 1 below. The mass of test item was determined (with Sartorius R200D) before (0.5452 g) and after (0.5046 g) the vapour pressure measurement. A mass loss of approx. 7 % (w/w) was observed.

Table 1: Measured vapour pressures and corresponding temperatures

Temperature / °C

Vapour pressure / hPa

10

5.5 x 10E-6

20

not evaluable

30

6.0 x 10E-6

40

5.1 x 10E-6

50

not evaluable
 60  1.8 x 10E-5
 70  2.2 x 10E-5
 80  3.6 x 10E-5
 90  9.0 x 10E-5
 100  2.9 x 10E-4
 110  9.3 x 10E-4
 90  8.7 x 10E-5

The data points measured below 60 °C were not included in the linear regression because the measured vapour pressure is below the detection limit of the method. The values for 20, 25 and 50 °C are calculated using the Antoine constants.

Conclusions:
The vapour pressure of the test item 4,4’-Dimethoxytrityl chloride was determined according to the OECD guideline 104 by effusion method using a vapour pressure balance. The vapour pressure was measured in the temperature range of 10 °C to 110 °C. The following vapour pressures were extrapolated from experimental data:
20 °C: 1.6 x 10E-5 Pa
25 °C: 2.8 x 10E-5 Pa
50 °C: 3.9 x 10E-4 Pa
Executive summary:

The vapour pressure of the test item 4,4’-Dimethoxytrityl chloride was determined according to the OECD guideline 104 by effusion method using a vapour pressure balance. The vapour pressure was measured in the temperature range of 10 °C to 110 °C. The following vapour pressures were extrapolated from experimental data:

20 °C: 1.6 x 10E-5 Pa

25 °C: 2.8 x 10E-5 Pa

50 °C: 3.9 x 10E-4 Pa

Description of key information

The vapour pressure of the test item 4,4’-Dimethoxytrityl chloride was determined according to the OECD guideline 104 by effusion method using a vapour pressure balance. The vapour pressure was measured in the temperature range of 10 °C to 110 °C. The following vapour pressures were extrapolated from experimental data:

20 °C: 1.6 x 10E-5 Pa

25 °C: 2.8 x 10E-5 Pa

50 °C: 3.9 x 10E-4 Pa

Key value for chemical safety assessment

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

Additional information