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EC number: 230-525-2 | CAS number: 7173-51-5
Henry's Law constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- Henry's law constant
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- From July 18, 2011 to April 24, 2012
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- accepted calculation method
- Principles of method if other than guideline:
- The Henry’s law constant of the test substance was calculated using both the solubility in water and the critical micelle concentration (CMC).
- GLP compliance:
- yes
- Key result
- H:
- ca. 0 Pa m³/mol
- Temp.:
- 20 °C
- Remarks on result:
- other: The value of of the Henrys law constant was estimated to be <8.4 x 10-12 atm x m3/moL
- Conclusions:
- Under the test conditions, the estimated Henrys law constant of the test substance was calculated to be <8.4 x 10-12 atm x m3/mol . Hence, the test substance was considered to be essentially non-volatile.
- Executive summary:
A study was conducted to determine the Henry’s law constant of DDAC. The Henry’s law constant of the test substance was calculated using both the solubility in water and the critical micelle concentration (CMC). Under the test conditions, the estimated Henrys law constant of the test substance was calculated to be <8.4 x 10-12 atm x m3/mol. Hence, the test substance was considered to be essentially non-volatile.
Reference
The molecular weight of the test substance is 362.08 g/mol. Using the vapour pressure of <1.5 x 10-3 Pa = <1.5 x 10-8atm determined during NOTOX project 499391. Using a water solubility of 645 g/L = 1.78 x 103 mol/m3supplied by the sponsor, Henry’s law constant was estimated to be <8.4 x 10-12atm.m3/mol. If the Henry’s law constant is <3 x 10-7atm x m3/mol, the test substance is less volatile than water and the concentration will increase when water evaporates. The test substance is considered essentially non-volatile.
Description of key information
Based on the study results, the test substance is considered to be non-volatile.
Key value for chemical safety assessment
- Henry's law constant (H) (in Pa m³/mol):
- 0
- at the temperature of:
- 20 °C
Additional information
A study was conducted to determine the Henry’s law constant of DDAC. The Henry’s law constant of the test substance was calculated using both the solubility in water and the critical micelle concentration (CMC). Under the test conditions, the estimated Henrys law constant of the test substance was calculated to be <8.4 x 10-12 atm x m3/mol (<8.5 x 10-7 Pa x m3/mol). Hence, the test substance was considered to be essentially non-volatile.
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