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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

at the temperature of:
20 °C

Additional information

The Henry's Law Constant (HLC) was estimated according to two different methods.

1) The Henry's Law Constant (HLC) was calculated for the uncharged molecule with the bond estimation method of HENRYWIN v3.20 (EPI Suite v4.11; BASF, 2013) to be 8.11E-04 Pa*m³/mol. The estimate is less accurate since the substance was not within the estimation domain of the model.

2) Based on measured data for vapour pressure (0.08 Pa at 20 °C) and water solubility (2010 mg/L at 20 °C) a HLC was estimated to be 9.5E-03 Pa*m³/mol (HENRYWIN v3.20, EPI Suite v4.11; BASF, 2013). This calculated result was selected as key value. The substance is within the applicability domain of the estimation model.

In summary, 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.