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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:
387 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
463 Pa

Findings

Measurement Values

The measured values are presented in the following table.

Measurement Values, Date: 26. Mar. and 27. Mar. 2020

1. Determination
increasing temperature

 

2. Determination
decreasing temperature

 

Temp. in °C

Time

Pressure in hPa

Date

Temp. in °C

Time

Pressure in hPa

Date

20.0

12:00

3.8

26. Mar. 2020

50.9

10:35

9.9

27. Mar. 2020

27.9

12:50

5.2

26. Mar. 2020

41.3

11:10

8.1

27. Mar. 2020

36.0

13:10

7.1

26. Mar. 2020

32.5

11:50

6.5

27. Mar. 2020

43.8

13:40

8.9

26. Mar. 2020

23.4

12:25

4.7

27. Mar. 2020

51.7

15:00

11.2

26. Mar. 2020

16.1

13:00

3.1

27. Mar. 2020

59.7

10:00

12.6

27. Mar. 2020

13.8

13:30

2.9

27. Mar. 2020

 

Calculation of Results

From the measured values for the increasing and for the decreasing temperature, log p (in log Pa) and 1/T (in 1/K) were calculated. The measured and the calculated values were plotted (p against T and log p against 1/T).

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

3.8

293.15

0.00341122

2.5798

2

27.9

5.2

301.05

0.00332171

2.7160

3

36.0

7.1

309.15

0.00323468

2.8513

4

43.8

8.9

316.95

0.00315507

2.9494

5

51.7

11.2

324.85

0.00307834

3.0492

6

59.7

12.6

332.85

0.00300436

3.1004

7

50.9

9.9

324.05

0.00308594

2.9956

8

41.3

8.1

314.45

0.00318016

2.9085

9

32.5

6.5

305.65

0.00327172

2.8129

10

23.4

4.7

296.55

0.00337211

2.6721

11

16.1

3.1

289.25

0.00345722

2.4914

12

13.8

2.9

286.95

0.00348493

2.4624

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

-1349.046491

Intercept

7.189935968

Correlation coefficient r

-0.992361098

Coefficient of determination r2

0.98478 0548

 

Using the equation which is stated in chapter9, vapour pressures at ambient temperature were calculated as:

Calculated Values for vapour pressure

Parameter

Value

Unit

Vapour Pressure (20.0 °C)

387

Pa

Vapour Pressure (25.0 °C)

463

Pa

 

Validity

The coefficient of determination r2was calculated with 0.984780548.This value is abovethe threshold of 0.95.

Discussion

The vapour pressure of the 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 387 Pa at 20.0 °C and 463 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.

Conclusions:
The vapour pressure of the test item was calculated as 387 Pa at 20.0 °C and 463 Pa at 25.0 °C.
Executive summary:

An experimental study, conducted in accordance with conditions recommended in OECD guideline and under GLP, is performed. The vapour pressure 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 387 Pa at 20.0 °C and 463 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 387 Pa at 20.0 °C and 463 Pa at 25.0 °C.

Key value for chemical safety assessment

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

Additional information

An experimental study, conducted in accordance with conditions recommended in OECD guideline and under GLP, is perfomed. It should be considered as a key study. The result should be retained as key data.