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Henry's Law constant

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Description of key information

The Henry´s law constant H is estimated as 240 Pa*m³/mol at ambient temperature, related to the vapour pressure and water solubility of wash oil.

Key value for chemical safety assessment

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

Additional information

The value H relates to the properties of the wash oil (Vp and water solubility), but using the molecular weight of the marker substance, acenaphthene: i.e. calculated from the MW of 154.2 g/mol, the water solubility (WSF) of 25 mg C/L [= 0.16 mol/m3] (20°C) and the vapour pressure of 38.5 Pa:

H = VP x MW / WSF [Pa*m3/mol]

Note: The Henry's law constant of acenaphthene is about 3.7 Pa*m3/mol (at 25 °C) (EU 2008).