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Vapour pressure

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Description of key information

Vapour pressure: 5.96E-05 Pa at 25 deg C.

Key value for chemical safety assessment

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

Additional information

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 determined experimentally.

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