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Environmental fate & pathways

Henry's Law constant

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Description of key information

Calculation with HENRYWIN v3.20 (EPIWIN software by US-EPA): 
Main component with chlorine: 7.11E-12 Pa*m³/mol (Bond Method), 4.72E-17 Pa*m³/mol (Group Method)
Main component without chlorine: 2.15E-9 Pa*m³/mol (Bond Method), 2.37E-14 Pa*m³/mol (Group Method)

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
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 (Chemservice S.A., 2012). 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 ratio 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 of the computer program HENRYWIN from US-EPA a Henry´s Law Constant of 7.11E-12 Pa*m³/molwas calculated for the substance 1,2,3-Propanetriol, glycidyl ethers with chlorine included. The Group Method showed a value of 4.72E-17 Pa*m³/mol for the main component with chlorine.The Henry´s Law Constant for 1,2,3-Propanetriol, Glycidyl ethers without chlorine are predicted as 2.15E-9 Pa*m³/mol and 2.37E-14 Pa*m³/mol concerning both methods, respectively. All predictions assumed a surrounding temperature of 25 °C.