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EC number: 205-597-3
CAS number: 143-28-2
Henry's Law Constant: Calculated HLC for (Z)-octadec-9-enol at environmental temperature (12°C): 6.06 Pa m3/mol
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.
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