Registration Dossier
Registration Dossier
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EC number: 206-992-3 | CAS number: 420-04-2
Henry's Law constant
Administrative data
- Endpoint:
- Henry's law constant
- Type of information:
- calculation (if not (Q)SAR)
- Adequacy of study:
- key study
- Study period:
- 2000-12-11
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 000
- Report date:
- 2000
Materials and methods
Test guideline
- Qualifier:
- no guideline required
- Principles of method if other than guideline:
- Henry`s law constant was calculated.
- GLP compliance:
- no
- Remarks:
- Not required for performing a calculation
Test material
- Reference substance name:
- Cyanamide
- EC Number:
- 206-992-3
- EC Name:
- Cyanamide
- Cas Number:
- 420-04-2
- Molecular formula:
- CH2N2
- IUPAC Name:
- cyanamide
- Test material form:
- other: aqueous solution
- Details on test material:
- - Test material: cyanamide
- Vapour pressure: P = 0.51 Pa (20°C) (Doc.No. 115-001)
- Water solubility: C=800 g/L=800,000 g/m³ (20°C)
- Molecular weight: MW=42.05 g/mol
Constituent 1
Results and discussion
Henry's Law constant H
- Key result
- H:
- 0 Pa m³/mol
- Temp.:
- 20 °C
- Atm. press.:
- 1 Bar
Any other information on results incl. tables
No remarks
Applicant's summary and conclusion
- Conclusions:
- Henry's law constant for cyanamide is H=0.0000268 Pa x M³/mol
- Executive summary:
The Henry´s law constant is the ration of vapour pressure to solubility and is therefore a measure of the partition of a compound between air and water. The Volatility of cyanamide could be calculated from the vapour pressure, molecular weight and water solubility data. The Henry´s law constant calculated for cyanamide at 20°C was found to be H=0.0000268 Pa x M³/mol.
If the value of H is below 0.5 Pa x m³/mol, which is the case for cyanamide, the phase transition resistance lies almost totally in the liquid phase, i.e, the volatility is liquid-phase controlled. If the value of H is greater than 500 Pa x m³/mol, volatilization is vapour-phase controlled.
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