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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Estimated Koc values for acetonitrile range from 0.3 - 16 and indicate a low potential for adsorption to soils.

Key value for chemical safety assessment

Additional information

The adsorption coefficient, Koc, can be estimated for acetonitrile using the octanol-water partition coefficient, log Pow = -0.34 (Leo et al., 1971), and Koc values of 0.3-16 were obtained using regression equations reported in Lyman et al (1982). EPA PCKOC software (v1.66) generated an estimated Koc of 4.5 for acetonitrile. These Koc values indicate a low potential for adsorption to soils; given the high water solubility of acetonitrile leaching to groundwater may be important when spilled on soil (Howard, 1993). Sorption on to clay soils would be due to partition between the interfacial clay and the bulk solution phases, and not due to any specific bonding (Howard, 1993).