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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:
March to May 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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:
yes (incl. certificate)
Type of method:
effusion method: by loss of weight or by trapping vaporisate
Key result
Temp.:
20 °C
Vapour pressure:
< 0 Pa

The evaporation rates (vT) at elevated temperatures were determined for the reference substances using a temperature program that was specific for each reference substance. Plots of the log vT obtained at elevated temperatures and 1/T were used to determine the logarithms of the evaporation rate at 20 °C (log VT20). The latter values were plotted against the vapour pressure at 20 °C in Pa. Linear regression analysis using the least squares method yielded an equation of the vapour pressure regression curve of log log PT20 = 1.04 x log VT20 + 4.32 (r = 0.993, n = 10). Validation of the method is performed at least once every year at the testing laboratory.

Conclusions:
The isothermal thermogravimetric effusion mthod was chosen for the determination of the vapour pressure of Sodium toluenesulphonate. The vapour pressure of the test substance at 20 °C was < 1.33 x 10E-8 Pa.
Executive summary:

The vapour pressure of Sodium toluenesulphonate was determined according to OECD Guideline for the Testing of Chemicals No. 104: "Vapour Pressure", March 23, 2006 and European Community, EC No. 761/2009, Part A: Methods for the Determination of Physico-chemical Properties, Guideline A.4: "Vapour Pressure", Official Journal of the European Union No. L220, August 24, 2009.

The isothermal thermogravimetric effusion mthod was chosen for the determination of the vapour pressure of Sodium toluenesulphonate. The vapour pressure of the test substance at 20 °C was < 1.33 x 10E-8 Pa.

Description of key information

The vapour pressure of Sodium toluenesulphonate at 20 °C was < 1.33 x 10E-8 Pa, determined by using the isothermal thermogravimetric effusion method.

Key value for chemical safety assessment

Additional information