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Environmental fate & pathways

Henry's Law constant

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Description of key information

From the water surface, the substance will not evaporate into the atmosphere.

Key value for chemical safety assessment

Additional information

The HLC for the uncharged mole was calculated to be 0.276 using HENRYWIN v3.20 (BASF SE, 2015). The dissociation constant (pKa) of the test substance was experimentally determined to be 7.63 (BASF AG 96L00234, 1996). This pKa value indicates that the molecule will partly exist as a cation under environmentally relevant conditions (pH 5 to pH 9). Therefore, the corrected HLC for ionized substances was calculated according to REACH Guidance Document R7a, Appendix R.7.1-2; pH correction of partition coefficients for ionisable substances, p. 189, May 2008. The resulting HLC values ranged from 0.000645 Pa*m³/mol (at pH 5) to 0.265 Pa*m³/mol (at pH 9).