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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:
04 may 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.
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other 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 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:
349 Pa
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
427 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

2.8

293.15

0.00341122

2.4472

2

27.1

4.7

300.25

0.00333056

2.6721

3

35.0

6.3

308.15

0.00324517

2.7993

4

40.0

7.5

313.15

0.00319336

2.8751

5

45.8

8.8

318.95

0.00313529

2.9445

6

55.0

11.6

328.15

0.00304739

3.0645

7

46.0

9.4

319.15

0.00313332

2.9731

8

40.0

8.0

313.15

0.00319336

2.9031

9

35.2

7.0

308.35

0.00324307

2.8451

10

27.1

5.6

300.25

0.00333056

2.7482

11

20.1

3.4

293.25

0.00341006

2.5315

12

15.0

2.9

288.15

0.00347041

2.4624

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

Parameter

Value

Slope

-1536.954614

Intercept

7.78568102

Correlation coefficient r

-0.977336262

Coefficient of determination (r2)

0.955186169

Using the equation, vapour pressures at ambient temperature were calculates as:

Parameter

Value

Unit

Vapour Pressure (20 °C)

349

Pa

Vapour Pressure (25 °C)

427

Pa

Conclusions:
Using the static method, vapour pressures of 349 Pa at 20 °C and 427 Pa at 25 °C were determined.
These values were calculated from the regression of 12 individual measurements, which were performed in a temperature range of 15.0 – 55.0 °C.
The measured values for pressure P and temperature T were used to calculate pairs of log P and 1/T. These values were plotted, from the linear regression, vapour pressures at ambient temperature were determined.
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.

Using the static method, vapour pressures of 349 Pa at 20 °C and 427 Pa at 25 °C were determined.

These values were calculated from the regression of 12 individual measurements, which were performed in a temperature range of 15.0 – 55.0 °C.

The measured values for pressure P and temperature T were used to calculate pairs of log P and 1/T. These values were plotted, from the linear regression, vapour pressures at ambient temperature were determined.

Description of key information

The vapour pressures of 349 Pa at 20 °C and 427 Pa at 25 °C were determined.

Key value for chemical safety assessment

Vapour pressure:
349 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.