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Physical & Chemical properties

Vapour pressure

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Administrative data

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
14 November 2018
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
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0.006 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.011 Pa

The vapour pressure was measured in the temperature range of 40 to 80 °C. For the evaluation the vapour pressure values in the range of 40 to 80 °C were used.

Results of the Effusion method

Stage No.

Temperature, °C

Δm/Δt, mg/min

Vapour pressure, Pa

1

40

4.3038 x 10-4

8.5238 x 10-2

2

45

6.6927 x 10-4

1.3361 x 10-1

3

50

1.0429 x 10-3

2.0981 x 10-1

4

55

2.2385 x 10-3

4.5385 x 10-1

5

60

3.8047 x 10-3

7.7722 x 10-1

6

65

5.8136 x 10-3

1.1965

7

70

8.7120 x 10-3

1.8062

8

75

1.5592 x 10-2

3.2559

9

80

2.9087 x 10-2

6.1176

 

Regression data of the vapour pressure curve - Regression output

Intercept

Slope

R. Squared

15.2141

-5114.2490

0.9955

 

Conclusions:
The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C to be 0.005865 Pa and 0.01150 Pa, 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 nine different temperatures between 40 and 80 °C using the effusion method. The vapour pressure was calculated taking into account the geometry of the Knudsen cell orifice, physical data of the test item and the evaporation rate Δm/Δt. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C to be 0.005865 Pa and 0.01150 Pa, respectively. 

Description of key information

The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C to be 0.005865 Pa and 0.01150 Pa, respectively (reference 4.6-1).

Key value for chemical safety assessment

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

Additional information

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 nine different temperatures between 40 and 80 °C using the effusion method. The vapour pressure was calculated taking into account the geometry of the Knudsen cell orifice, physical data of the test item and the evaporation rate Δm/Δt. The vapour pressure of the test item was calculated by extrapolation of the measured vapour pressure curve for the temperatures 20 and 25 °C to be 0.005865 Pa and 0.01150 Pa, respectively.