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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:
from 2018-11-15 to 2018-11-20
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
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
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
effusion method: Knudsen cell
Key result
Temp.:
20 °C
Vapour pressure:
6 999 Pa
Temp.:
25 °C
Vapour pressure:
7 867 Pa

The vapour pressure was measured in the temperature range of 28 to 40 °C. For the evaluation the vapour pressure values in the range of 28 to 40 °C were used.

Table 1. Results of the Effusion method

Stage No.

Temperature, °C

Δm/Δt, mg/min

Vapour pressure, Pa

1

28.2

3.4041 x 101

8.5019 x 103

2

30.0

3.5031 x 101

8.7756 x 103

3

32.2

3.7000 x 101

9.3018 x 103

4

34.1

3.7703 x 101

9.5084 x 103

5

36.0

4.0098 x 101

1.0143 x 104

6

38.0

4.0483 x 101

1.0274 x 104

7

40.0

4.3505 x 101

1.1076 x 104

 

Table 2. Regression data of the vapour pressure curve - Regression output

Intercept

Slope

R. Squared

6.8735

-887.8009

0.9812

 

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C:

Vapour pressure at 20 °C: 6.999 x 103 Pa

Vapour pressure at 25 °C: 7.867 x 103 Pa

Conclusions:
The vapour pressure of the test item was calculated to be 6999 Pa at 20 °C and 7867 Pa at 25 °C, respectively.
Executive summary:

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at temperatures between 28 and 40 °C using the effusion method (Knudsen cell). For the evaluation the vapour pressure values in the range of 28 to 40 °C were used. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C. The vapour pressure was calculated to be 6999 Pa at 20 °C and 7867 Pa at 25 °C, respectively.

Description of key information

The vapour pressure of the test item was calculated to be 6999 Pa at 20 °C and 7867 Pa at 25 °C, respectively.

Key value for chemical safety assessment

Vapour pressure:
6 999 Pa
at the temperature of:
20 °C

Additional information

A study (reference 4.6-1) was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at temperatures between 28 and 40 °C using the effusion method (Knudsen cell). For the evaluation the vapour pressure values in the range of 28 to 40 °C were used. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C. The vapour pressure was calculated to be 6999 Pa at 20 °C and 7867 Pa at 25 °C, respectively.