## Registration Dossier

Environmental fate & pathways

## Henry's Law constant

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### Link to relevant study record(s)

##### Reference
Endpoint:
Henry's law constant
Type of information:
calculation (if not (Q)SAR)
key study
Study period:
not applicable
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Qualifier:
no guideline followed
Principles of method if other than guideline:
This parameter is calculated from temperature corrected experimental vapour pressure and water solubility. Henry's Law Constant equation: (vapour pressure*molecular weight)/(water solubility*1000)
GLP compliance:
no
Key result
H:
2.75 Pa m³/mol
Temp.:
25 °C
Remarks on result:
other: Henry´s law constant is calculated based on temperature-corrected experimental vapour pressure and water solubility.
Conclusions:
A scientifically accepted calculation method is used to determine the Henry´s Law Constant. No GLP criteria are applicable for the usage of this tool and the estimation is easily repeatable. The Henry's Law Constant of the substance was estimated to be 2.75 Pa m³/mol at 25°C.
Executive summary:

The Henry´s Law constant of T000749 was determined. 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. This parameter is calculated based on temperature-corrected experimental vapour pressure and water solubility. A very low Henry´s Law Constant (2.75 Pa m3/mol) was calculated for T000749 related to 25 °C.

### Description of key information

A scientifically accepted calculation method is used to determine the Henry´s Law Constant. No GLP criteria are applicable for the usage of this tool and the estimation is easily repeatable. The Henry's Law Constant of the substance was estimated to be 2.75 Pa m³/mol at 25°C.

### Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
2.75
at the temperature of:
25 °C