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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 2-ethylhexanoic acid will not evaporate into the atmosphere. 

Key value for chemical safety assessment

Additional information

A Henry law constant (HLC) of 369 Pa*m³/mol was calculated by SRC HENRYWIN v3.20 (BASF SE, 2009). This indicates a volatile character of the test substance. However, 2 -ethylhexanoyl chloride is expected to rapidly hydrolyse and to form 2 -ethylhexanoic acid acid. Therefore, this model calculation may be of low relevance.

2 -Ethylhexanoic acid has a HLC of 0.289 Pa*m³/mol, which was calculated based on experimental data on vapour pressure and water solubility (BASF SE, 2009). Additionally, most of the 2 -ethylhexanoic acid molecules will be present in dissociated form under environmental relevant pH conditions (pKa = 4.72).

Therefore it may be concluded, that due to rapid hydrolysis, 2 -ethylhexanoyl chloride will only exist for a short time in water and the hydrolysis product does not evaporate into air.