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Environmental fate & pathways

Henry's Law constant

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Description of key information

Prediction with HENRYWIN v3.20: 0.116 Pa*m³/mol (Bond Method - most relevant), 0.216 Pa*m³/mol (Group Method)

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
0.116
at the temperature of:
25 °C

Additional information

The Henry´s Law constant of the test substance was determined by the computer program HENRYWIN v3.20 (EPIWIN software) by US-EPA.Henry´s law states that the solubility of a gas in a liquid solution at a constant temperature will be proportional to the partial pressure of the gas which is above the solution (Henry, 1803). Sometimes, the term “air/water partition coefficient” refers to the dimensionless Henry´s law constant (HLC) and therefore describes the ration of the equilibrium concentration of a dissolved substance in air and water.HENRYWIN estimates two separate HLC values (one using the group method and one using the bond method). The bond contribution methodology splits a compound into smaller units (one atom to another atom only). The bond method includes individual hydrogen bond values; the group method does not.Using the Bond Method a Henry´s Law Constant of 1.16 E-1 Pa*m³/molwas calculated for the test substance at 25 °C. The Group Method showed a value of 2.16 E-1 Pa*m³/mol.