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Environmental fate & pathways

Henry's Law constant

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Description of key information

From the water surface the hydrolysis product stearic acid will not evaporate into the atmosphere. 

Key value for chemical safety assessment

Additional information

A Henry law constant (HLC) of 6.27E3 Pa*m³/mol was calculated by SRC HENRYWIN v3.20 (BASF SE, 2009). This indicates a volatile character of the test substance. However, stearoyl chloride is expected to rapidly hydrolyse and to form stearic acid. Therefore, this model calculation may be of low relevance.

Stearic acid has a HLC of 0.0904 Pa*m³/mol, which was calculated based on experimental data on vapour pressure and water solubility (BASF SE, 2009). Additionally, most of the stearic acid molecules will be present in dissociated form under environmental relevant pH conditions (pKa = 4.75).

Therefore it may be concluded, that due to rapid hydrolysis, stearoyl chloride will only exist for a short time in water and the hydrolysis product does not evaporate into air.