Registration Dossier

Environmental fate & pathways

Henry's Law constant

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Cyclohexylamine is characterized by a measured Henry's Law Constant of 0.42 Pa*m³/mol at a temperature of 25 °C (Altschuh, 1999).  According to Thomas, cited in the "Handbook of Chemical property Estimation Methods" (Lyman, 1980), cyclohexylamine volatilizes only slowly from water, whereas the rate is strongly controlled by the slow diffusion through air.

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
0.42
at the temperature of:
25 °C

Additional information

Based on a dissociation constant of 10.68 (Perrin, 1965), the substance will, under environmental relevant conditions (pH 4 to 9), be present solely in the protonated form. Therefore, the measured HLC reflects the properties of the protonated form rather than the neutral species.