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Henry's Law constant

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Description of key information

The Henry's law constant quantifies the partitioning of a substance between the aqueous phase and the gas phase. As such it can be a measure for the partitioning of a chemical between natural water bodies (rivers, lakes, and seas) and the respective atmosphere.

Value used for CSA: Henry's law constant (H) at 20°C: 310 (in Pa * m3/mole)

Key value for chemical safety assessment

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

Additional information

The work of Rathbun (1998) summarises the findings of various experimental or interpolation determinations of the Henry's law constant by means of equilibrium partitioning in closed systems, equilibrium cell, batch stripping, multiple equilibration, multiple injection interrupted flow, static headspace, or wetted-wall column methods. The values reported for the Henry's law constant at 20 °C range from 279 to 337 Pa * m3/mole and the mean value is 310 Pa * m3/mole. This high value indicates that a rapid volatilisation of chloroform from water is likely under environmental conditions.