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Henry's Law constant

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Description of key information

Henry's Law Constant (DMSD): 2.84E-04 Pa m3mol-1at 20.2°C; 6.25E-04 Pa m3mol-1at 12°C.

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). Volatilisation from water is not relevant for the parent substance due to its rapid hydrolysis in contact with water.

No measured value for this parameter is available for the intermediate hydrolysis product, L3-diol. 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 L3-diol is 1.98E-03 Pa m3 mol-1 at 25°C.

An air-water partition coefficient (log Kaw) value of -6.94 at 20.2°C was determined for DMSD in a reliable study conducted according to an appropriate test protocol. This is equivalent to a Henry's Law Constant of 2.84E-04 Pa m3 mol-1 at 20.2°C; 6.25E-04 Pa m3 mol-1 at 12°C.