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Environmental fate & pathways

Henry's Law constant

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Description of key information

QSAR_HENRYWIN v3.20_Henry´s Law constant_Bond Method: 2.98E-2 Pa*m³/mol, Group Method: Incomplete result

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
0.03
at the temperature of:
25 °C

Additional information

The Henry´s Law constant of 1,3,4-Thiadiazolidine-2,5-dithione, reaction products with hydrogen peroxide and tert-nonanethiol was determined by the computer program HENRYWIN v3.20 (EPIWIN software) by US-EPA (Chemservice S.A., 2013). 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 of the computer program HENRYWIN from US-EPA a Henry´s Law Constant of 2.98 E-2 Pa*m³/mol was calculated at 25 °C. The Group Method showed an “incomplete Result”.