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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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The environmental fate of naphthenic acids, zinc salts, basic in the environment is most accurately evaluated by separately assessing the fate of its constituents zinc cations and naphthenate anions. The concept of biodegradation is not applicable to zinc cations since metals are not biodegradable. The removal from the water column was modelled referring to the EUSES model parameters and different conditions of pH. Zinc is removed by > 70% under the reference conditions for the EU regional waters (EUSES) and considered as equivalent to being "rapidly degradable” regarding the chronic aquatic hazard classification. Naphthenate can be considered to be readily / inherently biodegradable.

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