Phosphorous acid, tri-C12-14-alkyl esters

Vapour pressure

Link to relevant study record(s)

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

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

no

Qualifier:

according to guideline

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: T_exp= Experimental temperature (°C)

P_exp= 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.