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Vapour pressure

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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
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
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:
Vapour pressure < 1.33 x 10E-8 Pa at 20 °C
Executive summary:

The vapour pressure of Sodium toluene4-sulphonate 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.

Endpoint:
vapour pressure
Type of information:
other: Read across from another member of the category
Adequacy of study:
supporting study
Study period:
2015-05-27 to 2015-08-14
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
GLP compliance:
yes (incl. QA statement)
Type of method:
static method
Temp.:
20 °C
Vapour pressure:
8 Pa

Full test results

Temp (°C) Temp (K) Pressure (mbar) Pressure (Pa)
Run 1
20 293.15 0.08 8.0
24.4 297.55 0.1332 13.32
37.5 310.65 0.466 46.6
48.7 321.85 1.7 170
57.6 330.75 3.1 310
Run 2
20   293.15 0.08 8
24.7 297.85 0.1329 13.29
37.5 310.65 0.4715 47.15
49.9 323.05 1.6 160
57.4 330.55 3.2 320
Conclusions:
Vapour pressure = 8 Pa at 20 °C
Executive summary:

The vapour pressure has been determined using the static method in line with EU method A.4. The vapour pressure is found to be 8 Pa at 20 °C.

Description of key information

The HYDROTOPES Category comprises the following 6 substances:
STS - Sodium toluene 4-sulphonate (CAS 657-84-1, EC 211-522-5)
SXS - Sodium (xylenes and 4-ethylbenzene) sulphonate (EC 701-037-1)
NH4XS - Ammonium (xylenes and 4-ethylbenzene) sulphonate (EC 943-024-5)
SCS - Sodium p-cumenesulphonate (CAS 15763-76-5, EC 239-854-6)
KCS - Potassium p-cumenesulphonate (CAS 164524-02-1, EC 629-764-9)
NH4CS - Ammonium p-cumenesulphonate (CAS 680972-33-2, EC 811-484-5)


Two members of the category was tested for vapour pressure:
STS < 1.33 x 10E-8 Pa
NH4CS = 8 Pa
The test on SXS, SCS and KCS was waived based on melting point.
The vapour pressure on NH4XS was estimated with EPIWEB (Modified Grain Method) with a result of 3.57E-007 Pa at 25°C.
For sake of completeness vapour pressure was estimated with the same model with the followign results:
STS = 3.47 E-009 Pa
SXS = 2.03 E-007 Pa
CaXS = 1.6 E-009 Pa
SCS = 1.09 E-009 Pa
KCS = 1.52 E-009 Pa
NH4CS = 2.57 E-009 Pa


 

Key value for chemical safety assessment

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

Additional information