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Environmental fate & pathways

Henry's Law constant

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Description of key information

From the water surface the substance will not evaporate into the atmosphere. 

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
at the temperature of:
25 °C

Additional information

"The experimental value for the Henry constant of 0.034 Pa·m3 mol-1 at 25 °C (Betterton, 1988) indicates that volatilization from an aquatic environment is not expected under normal environmental conditions." (OECD, 2004)

This is underlined by Henry Law constants as derived from several literature studies, ranging from 0.022 to 0.034 Pa·m3 mol-1 (25°C) for formaldehyde (WHO, 2002; Environment Canada, 2001).