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Physical & Chemical properties

Vapour pressure

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Description of key information

The following results have been obtained from several databases and calculation software for the vapour pressure:
1) 0.00189 mm Hg = 0.0025 hPa (at 25 °C) [HSDB, 2006]
2a) 0.0025 mbar = 0.0025 hPa (at 25 °C) [Gestis, 2010]
2b) 1.3 mbar = 1.3 hPa (at 107 °C) [Gestis, 2010]
3) 0.3 Pa = 0.003 hPa (at 25 °C) [IPCS, 1999]
4a) 0.000687 mmHg =0.000916 hPa (at 25 °C) [MPBPWIN 1.43; exp. data by Ohe, S., 1976]
4b) 0.000313 mmHg =0.000418 hPa (at 25 °C) [MPBPWIN 1.43; calculated data using Modified Grain Method]

Key value for chemical safety assessment

Vapour pressure:
0.003 hPa
at the temperature of:
25 °C

Additional information

In the "Hazardous Substances Database" (HSDB) a vapour pressure of 0.00189 mm Hg (= 0.0025 hPa) at 25 °C is reported for triethyl citrate.

In the GESTIS substance database a vapour pressure of 0.0025 mbar (= 0.0025 hPa) at 25 °C and 1.3 mbar (=1.3 hPa) at 107 °C are reported for triethyl citrate.

In the "International Programme on Chemical Safety" (IPCS) database a vapour pressure of 0.3 Pa (= 0.003 hPa) at 25 °C is reported for triethyl citrate. No further details are available in all three databases.

As these results are (almost) identical, the key value was chosen to be 0.0025 hPa at 25 °C.

Further, the estimation of vapour pressure (as well as melting and boiling point) was done by the MPBPWIN program (v 1.43) made available by the U.S. Environmental Protection Agency. This program requires just the input of the chemical structure of the desired compound by SMILES notation. The calculation is done by three different methods: Antoine, Modified Grain and Mackay, whereby the Modified Grain method is preferentially utilized. By taking this method into account and using an experimental boiling point of 286.8 °C triethyl citrate has a vapour pressure of 0.000313 mm Hg at 25 °C. Finally, an experimental value is also stated in the database of the program, which confirms the estimated result: 0.000687 mmHg (=0.0916 Pa) at 25°C (Ohe, S., 1976).