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Environmental fate & pathways

Henry's Law constant

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Henry's law constant
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Principles of method if other than guideline:
The Henry's Law Constant (HLC) was calculated using the water solubility, molecular weight and vapour pressure according to the following formula: (vapour pressure*molecular weight)/water solubility. This approach is in accordance with ECHA Guidance R.16 (2016).
GLP compliance:
Key result
13.39 Pa m³/mol
20 °C
The calculated Henry's Law Constant is 13.39 Pa m³/mol at 20 °C, indicating that the substance will be moderately volatile from the water surface to the atmosphere.

Description of key information

13.39 Pa /mol (Equation R.16-4, ECHA guidance R.16, 2016)

Key value for chemical safety assessment

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

Additional information

The Henry’s Law Constant (HLC) was calculated according to equation R.16-4 of the ECHA Guidance R.16 (ECHA, 2016) using the molecular weight (238.41 g/mol), water solubility (0.13 mg/L) and vapour pressure (0.0073 Pa, 20 °C) as input parameters. The calculation resulted in an HLC of 13.39 Pa /mol, indicating that the substance will be moderately volatile from the water phase to the atmospheric compartment.