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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:
other: GLP guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
GLP compliance:
yes (incl. certificate)
Type of method:
static method
Temp.:
20 °C
Vapour pressure:
2.2 hPa
Temp.:
25 °C
Vapour pressure:
2.6 hPa
Temp.:
50 °C
Vapour pressure:
4.7 hPa

Results:

Temperature Vapour pressure [p/hPa]
 [°C] measurement calculation
19.9 2.2 2,24
39.9  3.8 3,72
49.9  4.8 4,7
60.0  5.9 5.9
79.9  8.8 8,94
99.8  12.6 13,07
119.8  19.1 18,56

The regression of the vapour pressure data leads with a mean deviation of 2.02% to the following equation:

ln (p/hPa) =11.0867 –3965.80 / (365.88 + t/°C)

In the temperature range used for vapour pressure measurements the test item was liquid.The graph enclosed (page 9) shows the vapour pressure curve.

The vapour pressures of the following table were calculated from the regression equation.

 

Description of key information

The vapour pressure of N,N'-bis(3-aminopropyl)ethylenediamine is 2.2 hPa at 20°C, 2.6 hPa at 25°C and 4.7 hPa at 50°C.

Key value for chemical safety assessment

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

Additional information