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Environmental fate & pathways

Henry's Law constant

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Description of key information

The substance is characterised by a calculated Henry Law Constant between 7.68 E-5 and 1.15 E-4 Pa m³/mol (Currenta, 2010b). According to Thomas, cited in the "Handbook of Chemical property Estimation Methods" (Lyman, 1980), the substance is less volatile than water. Therefore, the substance has to be scored as being non-volatile from water. 

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
0
at the temperature of:
25 °C

Additional information

The Henry’s law constant (HLC) is directly calculated as the ratio of the vapour pressure (0.001 Pa) to the water solubility (4 to 6 g/L), which are both experimentally determined at 25 °C. The molecular weight (460.56 g/mol) of the substance was also used for the calculation.

As no exact water solubility could be determined, the Henry's Law Constant was calculated for the lower and upper water solubility limit and is thus characterised by a range rather than a single value. According to guidance document R.7a (ECHA, 2008), the estimation based on the vapour pressure and water solubility is acceptable for substances with a water solubility smaller than 1 mol/L.