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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Studies on the adsorption/desorption behaviour of naphthenic acids, zinc salts, basic are not available. Thus, read-across to the assessment entities zinc cations and naphthenate anions is applied since the ions of the substance naphthenic acids, zinc salts, basic determine its fate in the environment. The following partitioning coefficients for zinc are applied: Kp for solid particulate matter and water (Kpsusp): 110000 l/kg, Kp for water and sediment (Kpsed): 73000l/kg, Kd for marine waters: 6010 l/kg, Kd for solids-water in soil: 158.5 l/kg. Regarding naphthenate, a LogKoc of 4.7 is applied in the CSA.

Key value for chemical safety assessment

Koc at 20 °C:
660.69

Additional information