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Environmental fate & pathways

Henry's Law constant

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Description of key information

Henry's Law constant was calculated to be 92 109 Pa.m3mol-1 for TFE at 1 atmosphere pressure (101 300 Pa) from the water solubility experimentally determined by Oriani of 110 mg/l at 28°C.

Key value for chemical safety assessment

at the temperature of:
20 °C

Additional information

Henry's Law constant was calculated for TFE at 1 atmosphere pressure (101 300 Pa) from the water solubility experimentally determined by Oriani of 110 mg/l at 28°C.

KH= 101 300 (Pa) x 100.02 (M.W.TFE) / 110 g/m3(solubility) = 92 109 Pa.m3mol-1or 0.909 atm.m3mol-1

Henry's Law constant was also calculated as 63 723 Pa.m3mol-1or 0.629 atm.m3mol-1 using the solubility of 159 mg TFE/l at 1 atmosphere measured by Volkhonovich et al (1966).

KH= 101 300 (Pa) x 100.02 (M.W.TFE) / 159 g/m3(solubility) = 63 723 Pa.m3mol-1or 0.629 atm.m3mol-1

Both calculated values of Henry's Law constant for TFE are high and indicate that the substance will readily partition to air from the water phase. The more recent value from the experimentally determined solubility of Oriani (2001) is considered to be more reliable.