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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:
2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study generated according to valid and internationally accepted standard testing guidelines.
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
not specified
Type of method:
static method
Temp.:
ca. 20 °C
Vapour pressure:
ca. 4.8 mBar
Remarks on result:
other: The uncertainty of measurement involved by the modelling of vapour pressure with our Antoine’s law is about +/- 0.2 mbar
Transition / decomposition:
no

Recordings of vapour pressure of the test item were obtained from the raw data reported in the table below. The measured data is self-consistent, as shown by the coefficient of determination: R²=0.9990.

Definition of terms: Texp= Experimental temperature (°C)

Pexp= Experimental pressure (mbar)

Texp

Pexp

1/Texp

ln(Pexp)

[°C]

[mbar]

[K-1]

in mbar

11.76

3.2

0.00351

1.1527

11.83

3.2

0.00351

1.1529

11.86

3.2

0.00351

1.1529

16.49

4.0

0.00345

1.3880

16.52

4.0

0.00345

1.3883

16.52

4.0

0.00345

1.3877

21.21

5.1

0.00340

1.6295

21.22

5.1

0.00340

1.6296

21.31

5.1

0.00340

1.6295

25.85

6.3

0.00334

1.8441

25.92

6.3

0.00334

1.8441

25.94

6.3

0.00334

1.8440

30.72

7.7

0.00329

2.0360

30.74

7.7

0.00329

2.0366

30.75

7.7

0.00329

2.0364

The uncertainty of measurement for pressure was about 1 mbar and for temperature, it was about 0.04°C.

The measured vapour pressures were used to regress the coefficients of Antoine's law reported in Table below. They enable to calculate the vapour pressure of the test item at any given temperature provided this temperature falls within the range specified in the same table.

Texp

Pexp

Pcalc

Pexp-Pcalc

[°C]

[mbar]

[mbar]

[mbar]

11.76

3.2

3.2

0.0

11.83

3.2

3.2

0.0

11.86

3.2

3.2

0.0

16.49

4.0

4.0

0.0

16.52

4.0

4.0

0.0

16.52

4.0

4.0

0.0

21.21

5.1

5.0

0.1

21.22

5.1

5.0

0.1

21.31

5.1

5.1

0.0

25.85

6.3

6.2

0.1

25.92

6.3

6.2

0.1

25.94

6.3

6.3

0.0

30.72

7.7

7.7

0.0

30.74

7.7

7.7

0.0

30.75

7.7

7.7

0.0

Conclusions:
The vapour pressure of the test item at 20°C was 4.8 mbar +/- 0.2 mbar.
The vapour pressure of the test item at 25°C was 6.0 mbar +/- 0.2 mbar.

The vapour pressure of the test item at 20°C was 480 Pa +/- 20 Pa.
The vapour pressure ofthe test item at 25°C was 600 Pa +/- 20 Pa.

Executive summary:

The vapor pressure has been determined according to guideline EC method A.4,OECD 104.

The vapour pressure of the test item at 20°C was 4.8 mbar +/- 0.2 mbar.

The vapour pressure of the test item at 25°C was 6.0 mbar +/- 0.2 mbar.

The vapour pressure of the test item at 20°C was 480 Pa +/- 20 Pa.

The vapour pressure ofthe test item at 25°C was 600 Pa +/- 20 Pa.

Description of key information

The vapour pressure of the phosphorous acid, triC12-C14 alkyl esters was determined in a GLP-compliant study performed in accordance with EC A.4 method and OECD Guideline No. 104, using the static method.

The vapour pressure at 20°C was 480 Pa +/- 20 Pa.

The vapour pressure at 25°C was 600 Pa +/- 20 Pa.

Key value for chemical safety assessment

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

Additional information

The vapour pressure of the phosphorous acid, triC12-C14 alkylesters was investigated in one GLP-compliant study performed in accordance with standard methods, without deviations. The study is considered as reliable (Klimisch 1) and is selected as a key study for the endpoint.