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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): 3.49E-2 Pa*m³/mol

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
0.035
at the temperature of:
25 °C

Additional information

The Henry´s Law constant of the test substance was determined by HENRYWIN v3.20 (EPIWIN software) (Chemservice S.A., 2015b). 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.

Using the Bond Method of the computer program HENRYWIN from US-EPA a Henry´s Law Constant of 3.49 E-2 Pa*m3*mol-1(first representative) and 1.91 E-1 Pa*m3*mol-1 (second representative) was calculated for the substance Benzenesulfonic acid, mono-C20-24 (even)-sec-alkyl derivs., para-, sodium salts at 25 °C. The Group Method showed an “incomplete result”.

No GLP criteria are applicable for the usage of this tool, but due to the fact that it is a scientifically accepted calculation method the estimations performed are reliable with restrictions and can be used for the chemical safety assessment.