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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 mm Hg

Temperature

[°C]

Dm

[mg]

Dt

[min]

Temperature

[K]

34.8

0.0694

80

307.95

34.8

0.0804

80

307.95

40.5

0.0838

80

313.65

40.5

0.0823

80

313.65

46.8

0.1044

80

319.95

46.7

0.1055

80

319.85

60.3

0.1101

80

333.45

60.4

0.1162

80

333.55

67.3

0.1170

80

340.45

67.2

0.1186

80

340.35

74.5

0.1278

80

347.65

74.6

0.1220

80

347.75

82.7

0.1366

80

355.85

82.6

0.1309

80

355.75

1/Temperature

[1/K]

Dm/Dt

[kg/s]

Vapour pressure

[Pa]

log p

3.25E-03

1.45E-11

5.62E-02

-1.2500

3.25E-03

1.68E-11

6.52E-02

-1.1861

3.19E-03

1.75E-11

6.85E-02

-1.1641

3.19E-03

1.71E-11

6.73E-02

-1.1719

3.13E-03

2.18E-11

8.62E-02

-1.0643

3.13E-03

2.20E-11

8.71E-02

-1.0598

3.00E-03

2.29E-11

9.28E-02

-1.0322

3.00E-03

2.42E-11

9.80E-02

-1.0088

2.94E-03

2.44E-11

9.97E-02

-1.0013

2.94E-03

2.47E-11

1.01E-01

-0.9955

2.88E-03

2.66E-11

1.10E-01

-0.9585

2.88E-03

2.54E-11

1.05E-01

-0.9786

2.81E-03

2.85E-11

1.19E-01

-0.9245

2.81E-03

2.73E-11

1.14E-01

-0.9430

y =mx +q

Parameterm

(slope)

Parameterq

(intercept)

ParameterR2

(correlation)

-615

1

0.91585

Extrapolation

at 20°C

1/Temperature

[1/K]

log p

Vapour pressure

[Pa]

0.00341

-1.2896

5.13 x 10-2

Conclusions:
The vapour pressure of the test item can be estimated as follows:
P = 5.13 x 10 -2
Pa = 3.85 x 10 -4 mmHg at 20°C
Executive summary:

This study was performed to determine the vapour pressure of the test item supplied by the Sponsor according to: OECD Guideline No. 104, EC method A.4, EPA Guideline OPPTS 830.7950 (1996).

Pa = 3.85 x 10-4 mmHg at 20 degrees Celsius

Description of key information

In an OECD 104 study, the vapour pressure measurements were carried out according to the Knudsen effusion method.

The vapour pressure of the substance is:

Pa = 3.85 x 10-4 mmHg at 20 degrees Celsius

Key value for chemical safety assessment

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

Additional information