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Environmental fate & pathways

Henry's Law constant

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Description of key information

Alpha-methylstyrene is highly volatile from aqueous solution (Henry's Law constant calculated:  258-439 Pa x m³/mole at 25°C).

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
439
at the temperature of:
25 °C

Additional information

Experimental data are not available. Therefore Henry's Law constant was calculated via a generally accepted calculation model and according to a generally accepted equation and using peer-reviewed input values.

Alpha-methylstyrene is highly volatile from aqueous solution (Henry's Law constant calculated using EPIWIN v3.11, HENRYWIN v3.10: 438.63 Pa x m³/mole and calculation according to the equation H=vp/ws: 282 Pa x m³/mole at 25°C each). The Henry's Law constant calculated according to the equation H=vapor pressure/water solubility and using reliable experimental derived values indicates also that alpha-methylstyrene is highly volatile from aqueous solution (H=258.32 Pa x m³/mole at 25°C).