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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:
2019-2020
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
2009
Deviations:
no
Principles of method if other than guideline:
Not applicable.
GLP compliance:
yes (incl. QA statement)
Remarks:
Inspected on 15-16/11/2017, Signed on 15/05/2018
Type of method:
static method
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
2 096 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
2 629 Pa

Results

The calculation results are presented in the following table:

Calculated values for 1/T and log P

n

Temperature T

Pressure p

Temperature T

1/T

log p

 

°C

hPa

K

1/K

log Pa

1

20.0

20.7

293.15

0.00341122

3.3160

2

27.9

30.8

301.05

0.00332171

3.4886

3

36.0

43.1

309.15

0.00323468

3.6345

4

43.8

56.8

316.95

0.00315507

3.7543

5

51.5

76.4

324.65

0.00308024

3.8831

6

55.4

91.1

328.55

0.00304368

3.9595

7

50.9

74.7

324.05

0.00308594

3.8733

8

43.7

56.6

316.85

0.00315607

3.7528

9

37.1

44.9

310.25

0.00322321

3.6522

10

28.3

31.4

301.45

0.00331730

3.4969

11

20.2

21.0

293.35

0.00340890

3.3222

12

15.1

16.2

288.25

0.00346921

3.2095

The parameters for the linear regression of the graph log (p) vs. 1/T are presented in the following table:

Linear Regression Parameters

Parameter

Value

Slope

-1719.024167

Intercept

9.18545486

Correlation coefficient r

-0.999276694

Coefficient of determination r2

0.998553911

 

Using the equation which is stated in the report, vapour pressures at ambient temperature were calculated as:

Calculated Values for vapour pressure

Parameter

Value

Unit

Vapour Pressure (20.0 °C)

2096

Pa

Vapour Pressure (25.0 °C)

2629

Pa

 

Conclusions:
The vapour pressure of the test item was calculated as 2096 Pa at 20.0 °C and 2629 Pa at 25.0 °C.
Executive summary:

An experimental study, conducted in accordance with conditions recommended in OECD guideline and under GLP, was performed. The vapour pressure of test item was measured using the static method as described in EU method A.4. Twelve pairs temperature/vapour pressure were used to calculate a regression from which vapour pressure at ambient temperature could be estimated.

From the measured values, the vapour pressure of the test item was calculated as 2096 Pa at 20.0 °C and 2629 Pa at 25.0 °C. The values of the heating and cooling down phase showed good correspondence.

Therefore, the result of the study is considered valid.

Description of key information

The vapour pressure of the test item was calculated as 2096 Pa at 20.0 °C and 2629 Pa at 25.0 °C.

Key value for chemical safety assessment

Vapour pressure:
2 096 Pa
at the temperature of:
20 °C

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. Therefore, it is considered as a key study.