Registration Dossier
Registration Dossier
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EC number: 201-167-4 | CAS number: 79-01-6
Henry's Law constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- Henry's law constant
- Type of information:
- calculation (if not (Q)SAR)
- Remarks:
- Migrated phrase: estimated by calculation
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: A calculation extensively described in peer reviewed literature
- Principles of method if other than guideline:
- Calculation according to Technical Guidance Document on Risk Assessment (EC, 2003)
- Key result
- H:
- 1 030 Pa m³/mol
- Temp.:
- 20 °C
- Conclusions:
- The Henry’s Law constant calculated from the ratio of vapour pressure to solubility is is 1,030 Pa.m3.mol-1.
Kair-water is 0.24.
Reference
The transfer of substances from the aqueous phase to the gas phase is estimated by means of its Henry's Law constant. If the value is not available in the input dataset, the required Henry's Law constant andKair-water(also known as the 'dimensionless' Henry's Law constant) can be estimated from the ratio of the vapour pressure (8,600 Pa at 20 C) to the water solubility (1,100 mg/L).
The Henry’s Law constant calculated from the ratio of vapour pressure to solubility is is 1,030 Pa.m3.mol-1.
Kair-water is 0.24.
Description of key information
The Henry’s Law constant is calculated to be 1,030 Pa.m3/mol at 20 degrees Celsius
Key value for chemical safety assessment
- Henry's law constant (H) (in Pa m³/mol):
- 1 030
- at the temperature of:
- 20 °C
Additional information
The Henry’s Law constant calculated from the ratio of vapour pressure to solubility is 1.03E3 Pa.m3/mol, and this value has been used in the EUSES calculations.
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