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EC number: 630-324-3 | CAS number: 861229-15-4
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)
- Adequacy of study:
- key study
- Study period:
- 2012
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- accepted calculation method
- Qualifier:
- no guideline required
- Principles of method if other than guideline:
- The Henry's law constant (HLC) for Mecoprop-P acid (MCPP-P acid) is directly calculated as a ratio of the vapor pressure 2.3E-04 Pa to the water solubility 860 mg/L, which were both experimentally determined at 20 °C. The molecular weight (214.65 g/mol) of Mecoprop-P acid (MCPP-P acid) was also used for estimation.
- GLP compliance:
- no
- Specific details on test material used for the study:
- pure
- Key result
- H:
- 0 Pa m³/mol
- Temp.:
- 20 °C
- Conclusions:
- Directly calculated as a ratio of the vapor pressure to the water solubility the Henry’s law constant (HLC) of MCPP-P acid, the hydrolysis product of MCPP-P 2-EHE, is 5.74E-05 Pa m3/mol. Therefore, MCPP-P acid is considered non-volatile from the aqueous phase.
- Executive summary:
MCPP-P 2-EHE hydrolyses rapidly in natural water. Therefore, the hydrolysis product MCPP-P acid was used for further assessment of MCPP-P 2-EHE in the environment.
The Henry's law constant of MCPP-P acid is 5.74E-05 Pa m3/mol at 20 °C, which is directly estimated as the ratio between the vapour pressure and water solubility. Therefore, MCPP-P acid is considered non-volatile from the aqueous phase.
- Endpoint:
- Henry's law constant
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- Please refer to section 13 for "Read Across justification".
- Reason / purpose for cross-reference:
- read-across source
- Key result
- H:
- 0 Pa m³/mol
- Temp.:
- 20 °C
Referenceopen allclose all
Description of key information
The Henry's law constant of the main hydrolysis product MCPP-P acid is 5.74E-05 Pa m3/mol at 20 °C, which is directly estimated as the ratio between the vapour pressure and water solubility.
Key value for chemical safety assessment
- Henry's law constant (H) (in Pa m³/mol):
- 0
- at the temperature of:
- 20 °C
Additional information
MCPP-P 2-EHE hydrolyses rapidly in natural water. Therefore, the main hydrolysis product MCPP-P acid was used for further assessment of MCPP-P 2-EHE in the environment.
Directly calculated as a ratio of the vapor pressure to the water solubility the Henry’s law constant (HLC) of MCPP-P acid [Allmendinger, 2012], the hydrolysis product of MCPP-P 2-EHE, is 5.74E-05 Pa m3/mol. Therefore, MCPP-P acid is considered non-volatile from the aqueous phase.
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