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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
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
GLP compliance:
yes
Type of method:
dynamic method
Temp.:
20 °C
Vapour pressure:
23.9 hPa
Remarks on result:
other: The vapour pressure of a bis(ethanolammonium)hexahydroxoplatinate solution containing approximately 10% platinum is 23.9hPa at 20°C.
Transition / decomposition:
yes
Transition temp.:
84.33 °C
Vapour pressure at 10°C above transition temperature:
1 001 hPa

The sample became darker and rising smoke was observed during the measurements starting from 84.33°C. Decomposition of the test item is a probable explanation. After the measurements the residual sample contained solid particles. Thus, the mathematical calculation was performed without the last data points starting from 598.6hPa.

Results: 
Vapour pressure (hPa) boiling temp (C) Comments
105.2 47 measured
125 50.47 measured
154.2 54.79 measured
201.6 60.45 measured
297.7 69.02 measured
399.4 75.66 measured
500.6 80.77 measured
598.9 84.33 measured
749.6 89.49 measured
853.7 92.38 measured
1001 95.2 measured
23.9 20 calculated by mathematical extrapolation using the Antoine equation
Conclusions:
The vapour pressure of a bis(ethanolammonium)hexahydroxoplatinate solution containing approximately 10% platinum is 23.9 hPa at 20°C.
Executive summary:

This study follows a standard guideline without deviation and is conducted to GLP. The study is considered reliable and can be used as the key study for this endpoint. The vapour pressure of a bis(ethanolammonium)hexahydroxoplatinate solution containing approximately 10% platinum is 23.9 hPa at 20°C.

Description of key information

The vapour pressure of a bis(ethanolammonium)hexahydroxoplatinate solution containing approximately 10% platinum is 23.9 hPa at 20°C.

Key value for chemical safety assessment

Vapour pressure:
23.9 hPa
at the temperature of:
20 °C

Additional information

Mekelburger (2002) follows OECD guideline 104 without deviation and is conducted to GLP. The study is considered reliable and can be used as the key study for this endpoint. The vapour pressure of a bis(ethanolammonium)hexahydroxoplatinate solution containing approximately 10% platinum is 23.9 hPa at 20°C.