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Environmental fate & pathways

Henry's Law constant

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Administrative data

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Reference
Endpoint:
Henry's law constant
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
accepted calculation method
Qualifier:
no guideline followed
Principles of method if other than guideline:
The Henry’s Law constant is calculated as H = P/S where P (vapor pressure) is expressed in units of Pascals or atmospheres and S (water solubility) is expressed in units of mol/m³.
GLP compliance:
no
Specific details on test material used for the study:
Methomyl (DPX-X1179)
Purity: Not reported
Key result
H:
0 Pa m³/mol
Temp.:
20 °C
H:
0 atm m³/mol
Temp.:
20 °C
Conclusions:
The constant for the test substance is 1.50E-6 Pa · m³/mol (1.48E-11 atm · m³/mol).
Executive summary:

The Henry’s Law constant, H = P/S where P (vapor pressure) is expressed in units of Pascals or atmospheres and S (water solubility) is expressed in units of mol/m³, was calculated for the test substance. Based on the experimentally determined vapor pressure of 4.75E-4 Pascals or 4.68E-9 atmospheres and water solubility of 51.25 g/L, the Henry’s Law constant for the test substance was calculated to be 1.50E-6 Pa · m³/mol or 1.48E-11 atm · m³/mol.

Based on this calculation, the test substance can be considered to have negligible escaping tendency from dilute aqueous solution.

Description of key information

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
0

Additional information