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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 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
March 23, 2006
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
August 24, 2009, Official Journal of the European Union L220
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: isothermal thermogravimetry
Key result
Test no.:
#1
Temp.:
ca. 20 °C
Vapour pressure:
1.03 Pa

The evaluation of the vapour pressure was done with the reproducible weight loss values above ≥ 1 µg/min and with the results above 40 °C.

 In the plot of the log νT of the test substance as function of the reciprocal temperatures the coefficient of correlation (r²) was 0.9987.

In the regression curve for calibration, the coefficient of correlation (r²) was 0.9825.

With extrapolation of the curve to 20 °C and fitting this value in the regression curve, a vapour pressure of 1.03 Pa was obtained (mean of three determinations, tusing the data obtained between 40 to 80 °C).

 

Conclusions:
The isothermal thermogravimetric effusion method was applied for the determination of the vapour pressure of Solvent Red 19T.
A value of the vapour pressure of the test item was determined using the data obtained between 40 °C and 80 °C. The vapour pressure of the test item was calculated (mean of three determi-nations) as: 1.03 Pa at 20 °C.
Executive summary:

The purpose of the study was to determine the vapour pressure of the test substance using the isothermal thermogravimetric effusion method in accordance with the standardised guidelines OECD 104 and EU Method A.9 under GLP conditions.

The evaporation rates of the test substance at elevated temperatures and ambient pressure were determined by monitoring the weight loss. Following a pre-test the main test was carried out above 40 and below 80 °C.

The test substance was added to the glass plate. The plate was placed in the TGA instrument. The weight loss of the test substance was measured continuously as a function of time at four different temperatures (three replicates): Start temperature: 40 °C; Isothermal interval: 5 minutes; Temperature increase: 10 °C interval with a ramp of 10 °C/min; End temperature: 80 °C

The vapour pressure of the test substance at 20 °C (293 K) was calculated to be 1.03 Pa (mean of three determinations).

Description of key information

The vapour pressure of the test item was calculated (mean of three determi-nations) as: 1.03 Pa at 20 °C.

Key value for chemical safety assessment

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

Additional information

The purpose of the study was to determine the vapour pressure of the test substance using the isothermal thermogravimetric effusion method in accordance with the standardised guidelines OECD 104 and EU Method A.9 under GLP conditions.

The evaporation rates of the test substance at elevated temperatures and ambient pressure were determined by monitoring the weight loss. Following a pre-test the main test was carried out above 40 and below 80 °C.

The test substance was added to the glass plate. The plate was placed in the TGA instrument. The weight loss of the test substance was measured continuously as a function of time at four different temperatures (three replicates): Start temperature: 40 °C; Isothermal interval: 5 minutes; Temperature increase: 10 °C interval with a ramp of 10 °C/min; End temperature: 80 °C

The vapour pressure of the test substance at 20 °C (293 K) was calculated to be 1.03 Pa (mean of three determinations).