Benzene, mono-C10-13-alkyl derivs., distn. residues, sulfonated, barium 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:

2017-10-16 - 2017-11-10

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:

EPA OPPTS 830.7950 (Vapor Pressure)

Version / remarks:

1996

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

spinning rotor

Specific details on test material used for the study:

A weighted average molecular weight for the sample (850 g/mol) was calculated based on information provided by the Sponsor and was used in the calculation of the vapor pressure.

Key result

Temp.:

20 °C

Vapour pressure:

0.002 Pa

The offset value (mean DCR) was 1.1075 x 10-7 s-1 at 20°C. This value was based on the average deceleration rate measured with an empty sample chamber.

The mean measured background vapor pressure of the system by the SRG method was 2.16 x 10-5 Pa at 20°C.

The mean measured vapor pressure of the reference substance, benzoic acid, by the SRG method was 6.11 x 10-2 Pa at 20°C. The vapor pressures were consistent with published values.

The system offset pressure using a weighted average molecular weight of 850 g/mol was 5.1630 x 10-5 Pa at 20°C. The mean measured vapor pressure of the sample, using a weighted average molecular weight of 850 g/mol, by the SRG was 2.27 x 10-3 Pa at 20°C. The barium sulfonate test substance is classified as an UVCB (i.e. Unknown or Variable compositions, Complex reaction products and Biological materials). According to the EPA OPPTS 830.7950 guideline, the SRG method for the determination of vapor pressure is applicable to multicomponent solids and liquids. The vapor pressure of a multicomponent material as determined by the SRG method would be reflective of the most volatile component of the material. The CV for the vapor pressure determination of sample at 20 ± 1°C was slightly below the estimated repeatability criteria for the SRG method (i.e. 10 to 20%) in the OPPTS 830.7950 guideline. The measured values for the vapor pressure measurements and system out-gassing rates for test-substance are presented in Table below.

Temperature (°C)	Measure Vapor Pressure (Pa)	Measured Out-gassing Rate (Pa/s)	Min/Max Temperature (°C)	Mean Measured Vapor Pressure (Pa)	Standard Deviation (Pa)	Coefficient of Variation (CV)	Mean Measured Out-gassing Rate (Pa/s)	Standard Deviation (Pa/s)
20	2.52 x 10E-3	2.42 x 10E-6	20.1 / 20.1	2.27 x 10E-3	2.2 x 10E-4	9.7 %	2.04 x 10E-6	3.3 x 10E-7
	2.11 x 10E-3	1.86 x 10E-6	20.1 / 20.2
	2.18 x 10E-3	1.85 x 10E-6	20.0 / 20.2

Conclusions:

The mean measured vapor pressure of the barium sulfonate test sample by the SRG was 2.27 x 10-3 Pa (N = 3, CV = 9.7%) at 20°C.

Executive summary:

The vapor pressure of barium sulfonate test substance was determined at 20°C using the spinning rotor gauge method. The test was conducted according to GLP, OECD guideline 104 and US EPA OPPTS 830.7950.

The mean measured vapor pressure of the barium sulfonate test sample by the SRG was 2.27 x 10-3 Pa (N = 3, CV = 9.7%) at 20°C.

Description of key information

The vapour pressure of the barium sulfonate test substance was determined at 20°C using the spinning rotor gauge method. The test was conducted according to GLP, OECD guideline 104 and US EPA OPPTS 830.7950.

The mean measured vapour pressure of the sample by the SRG was 2.27 x 10-3 Pa (N = 3, CV = 9.7%) at 20°C.

Key value for chemical safety assessment

Vapour pressure:

0.002 Pa

at the temperature of:

20 °C