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Environmental fate & pathways

Henry's Law constant

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Description of key information

Henry's Law constants have been reported for acetonitrile ranging from 2.07 - 8.0 Pa-m3/mole, indicating the potential for volatilization from surface waters and moist soils.

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
3.5
at the temperature of:
20 °C

Additional information

Henry's Law constants have been reported for acetonitrile ranging from 2.07 - 8.0 Pa-m3/mole (Snider and Dawson, 1985; Hine and Mookerjee, 1975; Gaffney, 1987 as cited in HSDB, 2009). These values indicate that volatilization of acetonitrile from surface waters and moist soils is likely to be significant (Howard, 1993).

US EPA HENRYWIN software (v3.10) calculated a Henry's Law Constant of 7.902E-5 atm-m3/mole (8.0 Pa-m3/mole) for acetonitrile based on vapor pressure of 200 mmHg and water solubility of 1.37E5 mg/L. Based on this value, volatilization half-lives for a model river and model lake were estimated to be 18 hours and 7 days, respectively.