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EC number: 412-570-1
CAS number: 119462-56-5
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
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.
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.
The vapour pressure of
was determined to be 0.00005 Pa at 25 °C.
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