Registration Dossier

Diss Factsheets

Environmental fate & pathways

Henry's Law constant

Currently viewing:

Administrative data

Link to relevant study record(s)

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 calculated pKa of 9.6 (SPARC modelling) indicates that the substance will primarily exist as a cation in the environment. Therefore the method described in the REACH Guidance Document R7a, Appendix R.7.1 -2 (pH correction of partition coefficients for ionisable substances, p. 189) was applied to correct for the pH. The HLC was corrected for the charged molecule to a value of 1.75E-11 Pa*m³/mol at pH 7 (range: 1.76E-13 to 1.38E-09 Pa*m³/mol, pH 5 to 9; BASF SE, 2013).

In conclusion, the HLC of the charged molecule is expected to be < 1 Pa*m³/mol (pH 7, 25°C). Therefore, from the water surface the substance will not evaporate into the atmosphere.