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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:
21 November 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
The study was conducted according to an internationally recognised method. Test substance is adequately characterised. Therefore full validation applies.
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
Qualifier:
according to
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. certificate)
Remarks:
Inspected on 13 and 14 October 2014/ Signed on 8 April 2015
Type of method:
static method
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
856 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
1 125 Pa

The calculation results are presented in the following table:

n

Temperature T

Pressure p

Temperature T

1/T

log p

 

°C

hPa

K

1/K

log Pa

1

20.0

8.3

293.15

0.00341122

2.9191

2

27.8

13.4

300.95

0.00332281

3.1271

3

36.3

20.0

309.45

0.00323154

3.3010

4

44.0

29.0

317.15

0.00315308

3.4624

5

52.0

40.4

325.15

0.00307550

3.6064

6

43.0

28.7

316.15

0.00316306

3.4579

7

34.0

18.4

307.15

0.00325574

3.2648

8

26.0

13.1

299.15

0.00334280

3.1173

9

21.0

9.0

294.15

0.00339963

2.9542

10

16.0

6.4

289.15

0.00345841

2.8062

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

Parameter

Value

Slope

-2073.638084

Intercept

10.00603241

Correlation coefficient r

-0.997003479

Coefficient of determination r2

0.994015937

Vapour pressures at ambient temperature were calculated as:

Parameter

Value

Unit

Vapour Pressure (20 °C)

856

Pa

Vapour Pressure (25 °C)

1125

Pa

Conclusions:
The vapour pressure of test item was measured using the static method as described in OECD 104 resp. EU A.4. Ten 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 856 Pa at 20.0 °C and 1125 Pa at 25 °C. The values of the heating and cooling down phase showed good correspondence.
Therefore, the result of the study is considered valid.
Executive summary:

This study was performed in order to determine the vapour pressure of test item according OECD 104, resp. EU A.4, using the static method.

From the measured values, the vapour pressure of the test item was calculated as 856 Pa at 20.0 °C and 1125 Pa at 25 °C.

Description of key information

The vapour pressure of the test substance was determined to be 856 Pa at 20 °C and 1125 Pa at 25 °C.

Key value for chemical safety assessment

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

Additional information

A fully reliable experimental study, conducted according to OECD 104 /EU A4 guideline, using static method, is available. It is considered as a key study, and the result is retained as key data.