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Environmental fate & pathways

Henry's Law constant

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Description of key information

The Henry's Law Constant has been calculated to be 0.022 Pa.m3/mol.

Therefore, Trifluoromethanesulfonic acid is considered to have a low volatility from water at 20°C.

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
0.022
at the temperature of:
20 °C

Additional information

The Henry's Law constant of Trifluoromethanesulfonic acid has been calculated according to the equation R16 -4 of the guidance on information requirements and chemical safety assessment - chapter R16: environmental exposure assessment (ECHA 2012).

The equation used is the following :

HENRY = ( VP x MOLW ) / SOL

With :

VP = 240 Pa at 20°C

MOLW = 150.08 g/mol

SOL = 1604000 mg/L at 20°C

The Henry's Law Constant has been calculated to be 0.022 Pa.m3/mol. Therefore, Trifluoromethanesulfonic acid is considered as low volatile from water at 20°C.