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Environmental fate & pathways

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Studies on the bioaccumulative 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 and toxicity in the environment.

Zinc is an homeostatically controlled, essential element which is actively regulated by organisms. Therefore, bioaccumulation is not considered relevant for zinc.

Available data suggest a low or no bioaccumulation potential for naphthenate: a BCF of 2 L/kg wet-wt based was measured in rainbow trout for one C-13 component of the naphthenic acids; the Japanese METI-NITI database reports a range of BCF from 1.6 to 27 L/kg wet-wt for sodium naphthenate.

Based on the low bioaccumulative potential of its dissociation products zinc and naphtenic acids, a similar low potential is assumed for naphthenic acids, zinc salts, basic.

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