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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 pKa value of 9.34 (Sparc online calculation, v4.2, 2008) indicates that aziridine will predominantly exist as a cation in the environment, therefore the calculated HLC of 0.74 Pa m3/mol for the uncharged molecule (HenryWin v3.20, 2008) was corrected according to REACH Guidance Document R7a, Appendix R.7.1-2. The pH-corrected HLC (pH 7) for the cation is 0.00336 Pa m3/mol (BASF SE 2010).