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Environmental fate & pathways

Henry's Law constant

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Description of key information

- Henry´s Law Constant: 0.163 Pa*m³/mol at 25 °C (bond method estimation)
- Henry´s Law Constant: incomplete result (group method estimation)

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 of1,3,4-Thiadiazole, 2,5-bis(tert-dodecyldithio)- (CAS 50530-43-3) [= one of the main constituents of the UVCB substance '1,3,4-Thiadiazolidine-2,5-dithione, reaction products with hydrogen peroxide and tert-dodecanethiol' (no CAS#, no EC#)] was determined by the computer program HENRYWIN v3.20 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 of the computer program HENRYWIN (by US-EPA) a Henry´s Law Constant of 0.163 Pa*m³/mol was calculated at 25 °C. The Group Method showed an “incomplete result”.