Alcohols, C10-16, ethoxylated, sulfosuccinates, disodium salts

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

12-Jan to 16-Jan-2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

GLP compliance:

yes (incl. QA statement)

Remarks:

ChemService S.r.l. Controlli e Ricerche, Ministero della Salute, 15 20026 Novate Milanese, Italy

Type of method:

effusion method: Knudsen cell

Temp.:

20 °C

Vapour pressure:

0.048 Pa

Temp.:

20 °C

Vapour pressure:

0 mm Hg

The result of the thermogravimetric analysis for test item and the vapour pressure at 20°C are given in the Table.

The plot of the log P of the test item as function of the reciprocal temperatures was drawn.

Data in the tables are rounded values taken from Excel spreadsheets which were archived together with the raw data. The use of Excel spreadsheets for calculations produces more accurate endpoints. These endpoints may slightly differ from the values derived by replacing the rounded values in the formulae given in the methods section.

 

Since the analysis was conducted under high vacuum conditions, the heat could be transferred only by radiation, this caused a consistent difference between the furnace temperature and the sample one and a considerable time for the system to reach equilibrium. The temperatures reported (registered by the thermocouple under the Knudsen cell) are hence different from the one set and the mass loss has been measured only in 80 minutes time interval within each isotherm, after the system had reached equilibrium.

 

Temperature [°C]	mass [mg]	time [min]	Temperature [K]
27.6	0.0603	80	300.75
27.8	0.0541	80	300.95
33.5	0.1181	80	306.65
33.6	0.1218	80	306.75
45.7	0.2828	80	318.85
45.9	0.2923	80	319.05
52.0	0.4281	80	325.15
52.1	0.4423	80	325.25
58.9	0.5998	80	332.05
59.0	0.6198	80	332.15
66.0	0.7715	80	339.15
66.3	0.7938	80	339.45
73.6	0.8547	80	346.75
73.8	0.8870	80	346.95
81.3	1.0815	80	354.45
81.6	0.9639	80	354.75

 

1/Temperature [1/K]	m / t [kg/s]	Vapour pressure [Pa]	log p
3.33E-03	1.26E-11	5.77E-02	-1.2387
3.32E-03	1.13E-11	5.18E-02	-1.2856
3.26E-03	2.46E-11	1.14E-01	-0.9425
3.26E-03	2.54E-11	1.18E-01	-0.9290
3.14E-03	5.89E-11	2.79E-01	-0.5548
3.13E-03	6.09E-11	2.88E-01	-0.5403
3.08E-03	8.92E-11	4.26E-01	-0.3705
3.07E-03	9.21E-11	4.40E-01	-0.3562
3.01E-03	1.25E-10	6.03E-01	-0.2195
3.01E-03	1.29E-10	6.24E-01	-0.2052
2.95E-03	1.61E-10	7.84E-01	-0.1055
2.95E-03	1.65E-10	8.07E-01	-0.0930
2.88E-03	1.78E-10	8.79E-01	-0.0563
2.88E-03	1.85E-10	9.12E-01	-0.0400
2.82E-03	2.25E-10	1.12E+00	0.0507
2.82E-03	2.01E-10	1.00E+00	0.0009
y = mx + q	Parameter m (slope)	Parameter q (intercept)	Parameter R^2 (correlation)
	-2521	7	0.94417
Extrapolation at 20°C	1/Temperature [1/K]	log p	Vapour pressure [Pa]
	0.00341	-1.3232	4.75 x 10^-2

Conclusions

The vapour pressure of the [TRADE NAME] sample can be estimated as follows:

P = 4.75 x 10^-2 Pa  = 3.56 x 10^-4 mmHg at 20°C

Description of key information

Vapour pressure: 4.75 x 10^-2 Pa = 3.56 x 10^-4 mmHg at 20 °C (Effusion method: Knudsen cell, EU Method A.4)

Key value for chemical safety assessment

Vapour pressure:

0.048 Pa