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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 Henry's Law Constant (HLC) was calculated for the uncharged molecule with the bond estimation method to be 1.05 Pa*m³/mol (HENRYWIN v3.20 of EPI Suite v4.10; BASF, 2013). Cyclopentylamine was within the estimation domain of the model. The pKa pf 10.39 (estimated, SPARC v4.6) 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 4.28E-04 Pa*m³/mol at pH 7 (range: 4.28E-07 to 4.11E-02 Pa*m³/mol, pH 4 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 the substance will not evaporate into the atmosphere.