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Environmental fate & pathways

Henry's Law constant

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Description of key information

1 -Chloro-2 -methylbenzene is characterized by a calculated Henry's Law Constant of 12.66 hPa m³/mol at ambient temperatures (e.g. 20- 25 °C) (Currenta, 2009). According to Thomas, cited in the "Handbook of Chemical property Estimation Methods" (Lyman, 1980), the substance tends volatilize rapidly from the liquid phase.

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
1 266
at the temperature of:
25 °C

Additional information

The Henry's Law Constant (HLC) is directly calculated as a ratio of the vapour pressure (470 Pa) to the water solubility (47 mg/L), which are both experimentally determined at 25 °C and 20 °C, respectively. The molecular weight (126.56 g/mol) of the test item was also used for the calculation. According to the guidance document R.7a (ECHA, 2008), the estimation based on the vapour pressure and water solubility is acceptable for substances with a water solubility smaller than 1 mol/L and thus applicable for 1 -chloro-2 -methylbenzene.