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Environmental fate & pathways

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It has to be considered, that based upon its pKa-values, adipic acid is mostly present as anion (i.e. deprotonated) under environmental pHs. As anions are neither subject to volatilization nor to adsorption, the hydrosphere is also the target compartment for the deprotonated molecule.

Due to the low vapour pressure of 0.097 hPa and the low Henry´s law constant of 0.0616 Pa m³/mole, adipic acid is expected to be distributed mainly to the aqueous compartment if released to the environment.

The estimated Koc values for adipic acid, using different accepted calculation methods are 1.61 L/kg (logKow method) and 24.34 L/kg (MCI method) (Currenta, 2019), indicating that the substance is not expected to adsorb neither to suspended solids and sediment in water nor to soil.

The distribution of adipic acid in a "unit world" was calculated according to the Mackay fugacity model level I (Currenta, 2009) based on the physico-chemical properties. The main target compartment for adipic acid is water with 97.89%, followed by air with 2.09 %, and minor amounts for soil and sediment.

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