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EC number: 201-877-4
CAS number: 89-04-3
Vapour pressure: 5.96E-05 Pa at 25 deg C.
Vapour pressure assessed on several studies, reporting estimation
methods using (Q)SPR techniques. Such methods were used as the expected
vapour pressure was at the lower limit of that which can be reliably
For low-volatility compounds, the method of Myrdal and Yalkowsky (1997)
tends to overestimate vapour pressures (Barley and McFiggans, 2010) when
provided with an experimental boiling point. The modified Grain method
by EPA MPBPWIN gives a value having the same order of magnitude of the
previous one. Therefore it appears reasonable to calculate the vapour
pressure of trioctyl benzene-1,2,4-tricarboxylate as the mean of Moller
and Nannoolal methods, to obtain a summary value suitable for the
assessments of the above substance.
VP= (6.72E-05 + 5.19E-05)/2= 5.96E-05 Pa= 4.47E-07 mmHg.
A structurally related substance, 1,2,4 -benzenetricarboxylic acid with
linear C8- and C10 -alcohols, produced by esterification of trimellitic
anhydride with a mixture of linear C8-C10-alcohols (40 - 60 % C8 and 40
- 60 % C10) rather than C8 alcohol alone was shown to have an
experimentally determined vapour pressure of 1.34E-7 Pa at 25 deg C
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