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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:
October 1992 - January 1993
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
Type of method:
effusion method: vapour pressure balance
Temp.:
25 °C
Vapour pressure:
0 Pa
Remarks on result:
other: rounded value

Result:

During pump down there was some initial degassing of the sample. In Run 1 the mass differences rose steadily from an ambient value of 0.268 µg at 24.75 °C (equivalent to about 3.5 X 10-4 Pascal) to a value of 5.37 µg (equivalent to around 7 X 10-3 Pascal) at 70.75 °C and then rapidly to a maximum of 23 µg at 81.3 °C before falling at around this temperature to 4.5 µg over some 10 minutes. The extrapolated value for Run 1 was

Vp (25 °C) = 4.647 X 10-4 Pa

with error range around 19 % and agrees well with the directly measured value.

The initial measured mass difference of Run 2 at 44.9 °C showed a decline by a factor of about 10 over the comparable region in the previous run. Values then rose to a maximum of 12.44 µg at 84.1 °C before falling at around this temperature to 3.28 µg over 10 minutes. The extrapolated value for Run 2 was

Vp (25 °C) = 6.952 X 10-6 Pa

with error range around 90 % and considerable curvature.

The initial measured mass difference of Run 3 at 66.9 °C showed a decline by a factor of about 2 over the comparable region in the previous run. Values then rose to a maximum of 2.384 µg at 84.35 °C. The extrapolated value for Run 3 was

Vp (25 °C) = 1.109 X 10-6 Pa

with error range around 50%.

In each run there is a tendency for the vapour pressure relationship to be curved and despite the rough agreement between the latter runs it is felt judicious to estimate a maximum room temperature by imposing a shallow slope. This yields for the initial mass difference of Run 3 (0.272 µg at 66.9 °C) a rounded value of

Vp (25 °C) = 5 X 10-5 Pa.

Conclusions:
The vapour pressure of 1,3-bis(3-methyl-2,5-dioxo-1H-pyrrolinylmethyl)benzene was determined at 0.00005 Pa at 25 °C.
Executive summary:

The vapour pressure of 1,3-bis(3-methyl-2,5-dioxo-1H-pyrrolinylmethyl)benzene was measured according to OECD guideline 104, EC method A.4 (Balance method). The vapour pressure was determined at 0.00005 Pa at 25 °C.

Description of key information

The vapour pressure of 1,3-bis(3-methyl-2,5-dioxo-1H-pyrrolinylmethyl)benzene

was determined to be 0.00005 Pa at 25 °C.

Key value for chemical safety assessment

Vapour pressure:
0 Pa
at the temperature of:
25 °C

Additional information