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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 at 25 °C was estimated to be 3.73E-5 Pa*m³/mol using SRC HENRYWIN v3.20 (BASF, 2014). The substance was within the estimation domain of the model. The HENRYWIN estimate refers to the uncharged molecule. The calculation of the Henry's Law constant via measured data for vapour pressure and water solubility is not taken into consideration as the method is not valid for substances like MEA which are miscible with water. The resulting HLC is 3.1E-3 Pa*m³/mol (BASF, 2014), but the value is disregarded. The estimated HLC value of the bond estimation method indicates that the substance will not evaporate into the atmosphere. However, most of the molecules of the test item will be present in a protonated form under environmental relevant pH conditions (pKa = 9.5). Considering that, the range of the HLC was calculated to be 1.18E-9 to 8.96E-6 Pa*m³/mol under environmentally relevant conditions with pH values from 5 to 9.

It can be concluded that the substance will not evaporate into the atmosphere from the water surface as the HLC is < 1 Pa*m³/mol.