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Description of key information

Henry's Law Constant: Calculated HLC for (Z)-octadec-9-enol at environmental temperature (12°C): 6.06 Pa m3/mol 

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
at the temperature of:
12 °C

Additional information

The transfer of a substance from the water phase to the gas phase can be estimated by means of the Henry’s Law Constant (HLC). No measured value for this parameter is available. The HLC can be estimated from the ratio of the vapour pressure (VP) to the water solubility (WS).

HLC = (VP x MW)/WS

Where MW is molecular weight.

The calculated HLC value for (Z)-octadec-9-enol at environmental temperature (12°C) is low, 6.06 Pa m3/mol (taken from EUSES 2.1.2).

Discussion of trends in the Category of C6-24 linear and essentially-linear aliphatic alcohols:

The Henry’s Law constant (HLC) describes the potential for volatilisation from water. No measured values are available, hence the HLC can be estimated, e.g. from the values of vapour pressure and water solubility. Values calculated in this way range between approximately 0.7 – 80 Pa.m3/mol (for 1-docosanol and 1-octadecanol respectively). Other category members have intermediate values. These values suggest low to moderate volatility from water, however fugacity modelling shows that a negligible proportion of the substance will be volatilised in the environment based on the overall equilibrium and taking into account degradation rates.