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Description of key information

The volatility of dissolved constituents from water phase is very low.

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
at the temperature of:
20 °C

Additional information

The value H (H = Pa*m³/mol) relates to the MW of the marker substance, benzo[a]pyrene (BaP) ( MW = 252.3 g/mol), to the water solubility of BaP (1.54 µg/L = 6.1 *10-6 mol/m3) (20°C), and the estimated vapour pressure of the coal-tar pitch of 6 *10-6 Pa(20 °C).